Keith Calix is the Chief Strategy and Operations Officer of the Institute on Generosity, where he leads strategic initiatives and operations to advance meaningful generosity and leadership.

Previously, he served as a high school teacher and Mayoral Appointee in Washington DC, where he advanced initiatives to improve student outcomes across the district. He was also Chief of Staff at the Laura Arrillaga-Andreessen Foundation, where he managed philanthropy education programs and grantmaking to expand access to meaningful work opportunities in the technology sector. At the Annie E. Casey Foundation, he supported research and grantmaking to strengthen systems serving vulnerable children and families.

Keith holds an MBA from Stanford Graduate School of Business, with a Certificate in Public Management and Social Innovation, and an MPA from Harvard Kennedy School, with a Certificate in Management, Leadership, and Decision Sciences.

Helen Cashman is the incoming Chief of Staff at the Institute of Generosity.

She began her career at McKinsey & Company, where she worked with clients in the US, Nigeria and Canada. She then joined Generation Youth Employed, a non-profit organization that trains and places people into life-changing careers in 17 different countries as Chief of Staff. She is passionate about youth education and empowerment and currently serves as Vice-Chair on the board of Girl Guides of Canada, the country’s largest organization focused on empowering girls and young women.

Helen is graduating in June with her MBA from Stanford Graduate School of Business, with a Certificate in Public Management and Social Innovation, and an MPP from Harvard Kennedy School, with a Certificate in Management, Leadership and Decision Sciences.

Julia Hess is the Program Associate at the Institute on Generosity, where she supports programming and project management with a focus on thoughtful execution and collaboration.

Before joining the Institute team, Julia worked as a program coordinator for the Pahara Institute in Colorado, where she managed curriculum development, event planning and onsite execution for leadership development programs for Pahara Fellows. Prior to Pahara, she ran a mentorship program in the Walla Walla Public Schools and led community-centered youth programming at Ekone Ranch. Julia graduated summa cum laude with an honors degree in sociology from Whitman College.

Stephanie Lo is the Executive Director of the Institute on Generosity, where she leads strategy, partnerships and organizational growth to advance meaningful generosity across communities.

Previously, Stephanie served as Vice President of Emerging Programs at Dalio Philanthropies, Interim Executive Director of OceanX Education and Head of Philanthropy at Endless. She was also the Founding Director of Programs at TED-Ed, where she helped build TED’s global youth education initiative into a platform reaching over one billion learners worldwide. Earlier in her career, Stephanie led growth and partnerships at Relay Graduate School of Education, supporting the expansion of innovative teacher preparation models.

Stephanie has worked across education and technology sectors in the U.S. and China. She holds a graduate degree from Harvard University and a bachelor’s degree from UCLA. She is committed to building institutions that unlock human potential and translate values into measurable impact.

Rafael Bitanga is a storyteller and educator who advances generosity through narrative, media and community voice. At the Institute, Rafael supports the development of content that brings generosity to life through human stories and shared reflection.

After immigrating from Laoag City, Philippines to Alaska as an 8-year-old, Rafael experienced firsthand how educational systems can overlook cultural knowledge and oral traditions. He began filmmaking in middle school and later founded Bitanga Productions to document stories from underrepresented communities. His work has reached thousands of students and educators across Alaska and was recognized by the Center for Asian American Media as a 2024 Fellow and Pitch Winner.

A graduate of Cornell University and Stanford University, Rafael integrates storytelling, education and technology to help communities document and share their lived experiences.

Katarina Czarniak is a philanthropy advisor and builder who brings bold ideas to life, designing initiatives that strengthen generosity and unlock more philanthropic capital.

Most recently, Kate served as founding Executive Director of P150, leading the network from pilot to fully operational platform with 400+ philanthropy advisors working with more than $90 billion USD in philanthropic capital. Previously, she built the philanthropy advisory practice ICONIQ Impact and led the Global Philanthropists Circle at Synergos. She began her career in global development, building programs at the Aga Khan Development Network, IREX and the Council of Europe. Kate’s work is guided by a conviction that bridging divides with generosity – of resources, trust and perspective – leads to better outcomes for people and planet.

Kate holds a master’s degree from Syracuse University’s Maxwell School of Citizenship and Public Affairs and a bachelor’s degree from the University of Rochester.

Leslie Lai is a social impact consultant advancing generosity through a cross-sector lens – bridging research and innovation with real-world implementation.

Most recently, she served as Director of Social Impact at Roku, Inc. where she built the company’s global employee volunteering program from the ground up and spearheaded Roku Change Makers, a Roku Original series that empowers high school filmmakers to spotlight community leaders through short documentaries. Before Roku, she advised global foundations and multilateral institutions on grantmaking strategy, cross-sector partnerships and impact measurement. She is known for building collaborative partnerships with nonprofit organizations to advance meaningful and community-driven change.

Leslie holds a BS and MS from the Massachusetts Institute of Technology and a Master’s in Public Affairs from Princeton University’s School of Public and International Affairs.

Sithara Rasheed brings nearly a decade of expertise in building and investing in innovation portfolios at the intersection of AI, technology and social impact. She previously served as Manager of Innovation Investments at the Rockefeller Foundation, where she scaled the organization’s first-ever applied innovation portfolio, designing investment strategies and pioneering initiatives in AI-enabled solutions and open data for underserved communities. Sithara is passionate about leveraging technology and philanthropic capital to drive systemic change in emerging markets. She holds an MA in International and Development Economics from Yale and is currently completing her MBA at Stanford GSB.

Herb Allen was elected as a director of The Coca-Cola Company in 2021. He has been president of Allen & Co. LLC since 2002. Allen & Co. is a privately held investment firm based in New York, focused on the media, entertainment, technology and other innovative industries. As president of Allen & Co., Allen has supervised all business operations, including financial advisory and investment banking services to public and private companies. He also supervises the firm’s principal financial and accounting officers.

Prior to Allen & Co., Allen held positions with T. Rowe Price and Botts & Co. Ltd. Allen is a graduate of Yale University and lives in New York. Allen currently serves as an alternate director for Grupo Televisa. He is an advisory board member for the Stanford Center on Philanthropy and Civil Society and the Center for a New Economy.

Marc Andreessen is a cofounder and general partner at the venture capital firm Andreessen Horowitz. He is an innovator and creator. He is also one of the few to pioneer a software category used by more than a billion people and one of the few to establish multiple billion-dollar companies.

Marc co-created the highly influential Mosaic internet browser while studying computer science at the University of Illinois at Urbana-Champaign. In 1994, he co-founded Netscape, which only four years later sold to AOL for $4.2 billion. In 1999, he co-founded Loudcloud, which as Opsware, sold to Hewlett-Packard for $1.6 billion. He later served on the board of Hewlett-Packard from 2008 to 2018.

Marc holds a BS in Computer Science. He also serves on the board of the following Andreessen Horowitz portfolio companies: Applied Intuition, Carta, Coinbase, Dialpad, Flow, Honor, Samsara, and TipTop Labs. He is also on the board of Meta.

Laura Arnold is co-founder and co-chair of Arnold Ventures, a philanthropy that supports research to understand the root causes of America’s most persistent and pressing problems, as well as evidence-based solutions to address them. By focusing on systemic change, Arnold Ventures is working to improve the lives of American families, strengthen their communities, and promote their economic opportunity.

Laura and her husband, John, first launched a charitable foundation in 2008. Their philanthropic focus has since broadened, and Arnold Ventures concentrates on areas such as education, criminal justice, health, infrastructure, and public finance, advocating for bipartisan policy reforms that will lead to lasting, scalable change. With an extensive, 15+ year history, Arnold Ventures has been one of the foremost results-oriented philanthropies in the United States. The Arnolds became signatories of the Giving Pledge in 2010.

Prior to Arnold Ventures, Laura was executive vice president and general counsel for a global oil exploration company based in Houston. She is a founding member of REFORM Alliance, a national criminal justice advocacy organization dedicated to reducing the number of people needlessly ensnared in a revolving door between supervision and prison. She also serves on the Leadership Advisory Council for the Tsai Leadership Program at Yale Law School.

Laura is a trustee emeritus for the Rice University Board of Trustees. She earned her law degree from Yale Law School, a master’s degree from the University of Cambridge, and a bachelor’s degree from Harvard College.

Laura was born and raised in Puerto Rico. She and John have three children and live in Houston.

Laura Arrillaga-Andreessen is a entrepreneur, academic, author and philanthropic leader. She is the founder of multiple Silicon Valley organizations, including Silicon Valley Social Ventures Fund (former Chairman Emeritus and Executive Director), Stanford Center on Philanthropy and Civil Society (former Chairman), The Laura Arrillaga-Andreessen Foundation—formerly Giving 2.0—(President), Andreessen Philanthropies (Co-founder and President) and Guild Theatre (Co-founder). She is currently in stealth mode, operationalizing a new operating foundation (in her copious free time). She has taught courses on philanthropy and leadership at Stanford Graduate School of Business since 2000 and authored the New York Times bestselling book, Giving 2.0: Transform Your Giving and Our World (Wiley, 2011). She is Co-president of the Arrillaga Foundation.

Since 2000, Laura has created and taught Stanford Graduate School of Business’ (GSB) first courses on Strategic Philanthropy, Individual Philanthropy, Philanthropy, Inclusivity and Leadership, and Philanthropic Institutions and Justice. Laura has also developed and taught Women in Leadership: The Power of You to prepare students to navigate the challenges women leaders face in the workplace and to advance generosity and impact through her “meaningful leadership” model. In addition, she has created courses at Stanford University on design thinking for impact, technology’s disruption of the social sector and grantmaking.

Laura was the Founder, Chairman Emeritus (2008-2026) and former executive director (1998–2008) of Silicon Valley Social Ventures Fund (SV2), a venture philanthropy fund of over 200 individuals who leverage their financial, intellectual and human capital to fund and scale innovative nonprofits. To date, SV2 has funded over 200 nonprofits and social enterprises in the Bay Area, providing nearly $10 million in funding. She is a former trustee of the National Gallery of Art, Silicon Valley Community Foundation, Hoover Institution, Castilleja School, Menlo School, Eastside Preparatory School and San Francisco Art Institute.

Laura was also the Founder and Board Chairman (2006–2024) of Stanford Center on Philanthropy and Civil Society (PACS), a global research center committed to exploring ideas and strategies for the social change sector and publisher of the award-winning Stanford Social Innovation Review (SSIR).

Laura’s award-winning book, Giving 2.0, empowers people of all backgrounds, ages and passions to give their time, money, networks and expertise with greater impact. Laura is a contributing author to Frontiers in Social Innovation (Harvard Business Review Press, 2022) and has written for The Washington Post, Worth Magazine, T Magazine – The New York Times, Huffington Post and SSIR.

Laura has been profiled in The New York Times, The Wall Street Journal, Barron’s, Forbes, The Chronicle of Philanthropy and Vogue. She has been featured on Charlie Rose, CNN with Erin Burnett, MSNBC and CNBC Power Lunch. In addition to receiving numerous California philanthropy awards, Laura was a 2005 Henry Crown Fellow of the Aspen Institute, received the 2005 President’s Volunteer Service Award from the Points of Light Foundation, was honored with the World Affairs Council’s Global Philanthropy Forum 2011 Global Citizen Award and was awarded the 2014 Commonwealth Club Distinguished Citizen Award.

Laura holds an MBA from the Stanford GSB, as well as an MA in Education and both a BA and MA in Art History, all from Stanford University. In total, Laura holds five degrees from Stanford including one conferred by Bing Nursery School, where she graduated with honors by consuming vast quantities of Play-Doh under the crafts table. In her illimitable free time, she is an active investor, real estate developer and mentor to countless past students. Laura finds immense joy in dancing (by herself or with others), perennial mistletoe, copious salt consumption, disco balls, combat boots and her all-black wardrobe. Laura lives with her trophy husband, technology entrepreneur and venture capitalist Marc Andreessen, near Stanford University. Together, they are obsessed with reading, post-war American art, the golden age of streaming and laughing to the point of incapacitation. Inspired by their progeny, they are raising two rambunctious robots dogs (It and Thing) in a home bulging with innumerable books and boundless love. They keep many Christmas decorations up year-round and consider Winnie the Pooh an immediate family member.

Stephanie Coleman is Founder of Coleman Family Ventures (CFV), an impact-focused organization that invests in leaders and innovators across education, healthcare, poverty, and ocean-based climate solutions.

Stephanie is also Co-Founder of Valentines Farm, a small biodynamic farm with the mission of growing high-quality food, educating farmers in training, and providing for local communities.

In addition, Stephanie serves as Vice Chair of the Board and Co-Chair of the Digital Transformation Committee at New York Presbyterian Hospital, Vice Chair of the Board of Harlem Children’s Zone, Vice Chair of the Board of The Chapin School and sits on the Women’s Committee of The Boys Club of New York.

Earlier in her career, Stephanie worked in investment banking at Merrill Lynch and later in fashion at Anne Klein and Vera Wang. She holds a B.A. from Wellesley College and lives in New York with her husband Chase and their four children.

Megan Holston-Alexander is a partner at Andreessen Horowitz where she leads the Cultural Leadership Fund (CLF), Silicon Valley’s first venture capital fund consisting exclusively of Black cultural leaders and organizations committed to Black wealth generation. Megan oversees CLF’s dual missions of connecting the world’s greatest cultural leaders including athletes, entertainers, musicians and C-level executives, to the best new technology companies and engaging and elevating African Americans in the technology industry.

Born and raised in Montgomery, Alabama, Megan graduated with a BA from Clark Atlanta University and an MBA from Stanford Graduate School of Business, where she relaunched the Black Business Conference after a 10+ year hiatus. Megan also co-founded When Founder Met Funder, a conference focused on connecting Black female entrepreneurs with peers and investors for networking and fundraising support.

She currently serves on the board of THINK450, the partnership and innovation engine of the National Basketball Players Association (NBPA), the boards of three nonprofits, All Stars Helping Kids, HBCUvc, and The Hidden Genius Project, along with the advisory board of the Southwestern Athletic Conference (SWAC). Megan previously served on the advisory committee of the 50 Fund, the philanthropic arm of Super Bowl 50. Megan enjoys spending her downtime with her two boys, Holston and Jack, and truly believes you can’t beat a good spa day.

Ben Horowitz is a cofounder and general partner at the venture capital firm Andreessen Horowitz. He is the author of the New York Times bestsellers, The Hard Thing About Hard Things and What You Do Is Who You Are. He also created the a16z Cultural Leadership Fund to connect the greatest cultural leaders to the best new technology companies, and enable more young African Americans to enter the technology industry.

Prior to a16z, Ben was cofounder and CEO of Opsware (formerly Loudcloud), which was acquired by Hewlett-Packard for $1.6 billion in 2007, and was appointed vice president and general manager of Business Technology Optimization for Software at HP. Earlier, he was vice president and general manager of America Online’s E-commerce Platform division, where he oversaw development of the company’s flagship Shop@AOL service. Previously, Ben ran several product divisions at Netscape Communications. He also served as vice president of Netscape’s widely acclaimed Directory and Security product line. Before joining Netscape in July 1995, he held various senior product marketing positions at Lotus Development Corporation.

Ben has an MS and a BA in computer science from UCLA and Columbia University, respectively.

Ben serves on the board of Anyscale, Databricks, Mayvenn, NationBuilder, Navan, and UnitedMasters.

Kathleen Kelly Janus has spent more than two decades proving that the most intractable social challenges can be solved when government, philanthropy, and communities move resources at the speed of crisis. As Principal for Philanthropy and Social Innovation at J Capital, she leads the family’s philanthropic portfolio focused on strengthening public private partnerships and building the capacity of organizations working toward transformative change.

Kathleen’s approach is grounded in a simple conviction: partnerships fail when they are transactional and succeed when they are built on trust, shared risk, and long-term commitment. As Senior Advisor on Social Innovation to California Governor Gavin Newsom, she led more than fifty partnerships totaling $4.2 billion across homelessness, child poverty, and community resilience. Her work mobilized philanthropic and corporate capital to strengthen government systems and scale solutions statewide. She has also advised national, state, and local leaders, including the White House, Maryland Governor Wes Moore, and San Francisco Mayor Daniel Lurie, on partnership strategies that unlock resources and accelerate impact.

A Lecturer at Stanford University for more than fifteen years, Kathleen teaches social entrepreneurship with the Mimi and Peter E. Haas Distinguished Visitor Program, which brings innovative public sector leaders to campus each year. She is the author of Social Startup Success: How the Best Nonprofits Launch, Scale Up and Make a Difference, a widely adopted playbook for early-stage social ventures. Her insights on cross sector collaboration have shaped national conversations through her TEDx talk and in outlets including the Wall Street Journal, Stanford Social Innovation Review, and Fast Company.

Kathleen lives in San Francisco with her husband, Ted, and their three children, working toward a future that is both more joyful and more just.

Ted Janus is Principal of J Capital, where he invests in select private and public equities across financial services, technology, and consumer sectors, with a particular interest in technology-driven companies that modernize large and complex industries. He also invests in private equity and venture capital funds, with a long-standing interest in supporting emerging managers and rigorous approaches to value creation.

From 1997 to 2009, Mr. Janus was a partner and director of research at Palo Alto Investors. He served as portfolio manager of the firm’s small cap and micro cap funds and led coverage of financial services and consumer companies. Prior to joining Palo Alto Investors, he worked in finance and product management within Bank of America’s Investment Services group.

Mr. Janus is a former board member at the Stanford Center on Philanthropy and Civil Society and the Haas School of Business at the University of California, Berkeley. He is a frequent lecturer on investing at universities and colleges. He holds a BA in Political Science and an MBA from the University of California, Berkeley, and is a CFA charterholder.

He lives in San Francisco with his wife, Kathleen, and their three children. His focus today is on disciplined investing, principled partnerships, and contributing to a future where generosity, integrity, and community leadership guide how capital and opportunity flow.

Julia Milner, together with her husband Yuri, established the Breakthrough Prize Foundation, a non-profit dedicated to advancing fundamental knowledge, celebrating scientific achievement, and harnessing scientific and technological innovation to improve people’s lives and inspire future generations. The Foundation’s programs include the Breakthrough Prize—widely known as the “Oscars of Science”—which honors leading scientists in Life Sciences, Fundamental Physics, and Mathematics, as well as the Breakthrough Initiatives, a suite of research programs exploring the deepest questions about life in the universe.

Under Julia’s patronage, the Foundation launched the Breakthrough Junior Challenge, a global science video competition designed to cultivate young people’s understanding of scientific principles; spark excitement for STEM fields; support students pursuing related careers; and engage the broader public in the key ideas of fundamental science. Since its creation in 2015, the Challenge has received more than 25,000 submissions from over 200 countries.

Julia studied painting and photography, and her internet project Click I Hope was exhibited at the 52nd Venice Biennale of Contemporary Art in 2007. She and her husband are parents to four daughters and share a deep love of travel, art, and culture. They are also active participants in the international film community.

David Siegel is a computer scientist, entrepreneur, and philanthropist. He co-founded Two Sigma with the belief that innovative technology, AI, and data science could help discover value in the world’s data. Today, Two Sigma drives transformations across the financial services industry in investment management, venture capital, private equity, and real estate.

David’s philanthropic efforts underscore his conviction that education, science, and technology are the keys to a better world. In keeping with this vision, he founded Siegel Family Endowment in 2011 to support organizations and leaders that will understand and shape the impact of technology on society. In addition, in early 2024 David founded Open Athena, a nonprofit organization that bridges the gap between academic research and the AI frontier. Open Athena empowers universities with elite AI and data engineering talent to allow groundbreaking discoveries at scale.

David is a member of the MIT Corporation, Vice Chair of the Scratch Foundation, and a member of the Cornell Tech Council. He also serves as a board member of Re:Build Manufacturing, Khan Academy, NYC FIRST, and Carnegie Hall.