Board of Directors

Henrique De Castro joined the Board of Fiserv, Inc. as a Director in 2019 after serving as a Director of First Data since 2017. Mr. De Castro is also a Director of the Board at Banco Santander S.A. (BMAD: SAN) and previously served on the Board of Directors of Target Corporation (NYSE: TGT). He led Cantor Fitzgerald’s venture capital arm, Cantor Ventures, from 2015 to 2019 and served as Chief Operating Officer at Yahoo! Inc. between 2012 and 2014. Prior to that, Mr. De Castro held senior executive positions at Google including President of Partner Business, responsible for approximately a third of Google's revenues and President of Media, Mobile & Platforms where he built and scaled the business globally to over 50 countries.

Prior to Google, Mr. De Castro had senior executive roles at Dell Technologies and McKinsey & Company. Mr. De Castro has extensive experience across the globe in the Technology, Internet, Media and Retail industries. He has an MBA from IMD in Switzerland and a Bachelor in Business and Economics from ISEG in Lisbon. He is fluent in English, French, Italian, Spanish and Portuguese

Stephanie Cohen joined the Board of Fiserv, Inc. in March 2025. Ms. Cohen is chief strategy officer of Cloudflare Inc., a leading cloud connectivity company, enhancing the security, performance, and reliability of websites and applications for its global clients. She joined Cloudflare in 2024, and leads corporate, infrastructure, and network strategy and drives the company’s key initiatives in network expansion, artificial intelligence, and its developer platform. Before joining Cloudflare, Ms. Cohen was a member of the management committee at Goldman Sachs, holding various leadership positions from 1999 to 2024 including global head of platform solutions, global co-head of consumer and wealth management, head of financial sponsors mergers and acquisitions, and chief strategy officer. Ms. Cohen serves on the Board of Trustees of the Economic Club of New York and on the Board of Directors of Quill.org. 

Harry F. DiSimone has served as a Director of Fiserv, Inc. since 2018. Mr. DiSimone founded and served as President of Commerce Advisors, Inc., a consulting and advisory services firm for the retail financial services and payments industries, from 2008 to 2020. From 2010 to 2015, he served as Co-Managing Partner of Encore Financial Partners, Inc., a company focused on the acquisition and management of banking organizations in the United States, which Mr. DiSimone also co-founded. Prior to 2008, Mr. DiSimone spent over 30 years at J.P. Morgan Chase & Company and its predecessor organizations holding various senior level positions including Executive Vice President, Chief Operating Officer of the Chase credit card business, Private Label Card and Merchant Processing Executive, Retail Bank Chief Marketing Officer, Consumer Banking, Investments and Insurance Executive and Chase Personal Financial Services Executive.

Mr. DiSimone previously served as a director at Reliant Funding, Inc., a privately held provider of short-term small business loans, and ClearBalance Inc., a privately held provider of patient loan programs to hospitals and health care systems nationwide. He has also advised a number of retail banking and payment organizations, including The Direct Marketing Association (now known as The Data & Marketing Association), the NYCE Payment Network, Chase Paymentech, MasterCard’s U.S. Business Committee, Visa Global Advisors, the New York Clearing House’s Strategic Planning Committee and the Federal Reserve Bank’s Payment Card Council.

Lance Fritz joined the Board of Fiserv, Inc. as a director in February 2024. Fritz served as Union Pacific chairman, president and chief executive officer from 2015 until 2023, when he retired from the railroad after 23 years of service. He joined Union Pacific in 2000 as vice president and general manager of marketing and sales and served in various executive positions during his career, including in operations, labor relations and as president and chief operating officer of Union Pacific Railroad.

Before joining Union Pacific, Fritz worked for Fiskars Inc., Cooper Industries and General Electric. He is a graduate of Bucknell University and earned a master’s degree in management from the Kellogg School of Management at Northwestern University. Fritz serves as a member of the board of directors of Parker-Hannifin Corporation and The Business Council. He also serves on the Georgia Institute of Technology president’s advisory board. Fritz is deeply involved with community organizations in his hometown of Omaha, Nebraska.

Ajei Gopal joined the Board of Fiserv, Inc. in March 2024. Mr. Gopal has served as president and chief executive officer of ANSYS, Inc., an engineering simulation solution provider, since 2017. He joined the company in 2016 as president and chief operating officer. Previously, Gopal was an operating partner for Silver Lake Partners, a senior vice president and general manager of Hewlett Packard Software, and executive vice president at CA Technologies. He has also served as executive vice president and chief technology officer at Symantec and was the founder and CEO of ReefEdge Networks. Mr. Gopal has served as a director of ANSYS, Inc. since 2011 and previously served as a member of the board of directors of Citrix Systems from 2017 through 2021.

Mike Lyons serves as CEO for Fiserv, Inc. (NYSE: FI), a position he assumed on May 6, 2025, after serving as President and CEO-elect. Prior to joining the company, Lyons served as President of The PNC Financial Services Group where he led PNC’s lines of business. Prior to his role as President, Lyons served as head of Corporate & Institutional Banking at PNC where he played a significant role in building PNC’s national franchise.

Before joining PNC, Lyons held various leadership roles at Bank of America. As global head of corporate development and strategic planning, Lyons helped drive the bank’s growth strategy. Additionally, he led mergers and acquisitions in the private equity business and investor relations. Before Bank of America, Lyons served as portfolio manager at Maverick Capital where he invested in financial institutions globally.

He is a national trustee of the Boys & Girls Clubs of America, a member of the board of directors at University of Pittsburgh Medical Center (UPMC), and board chair for the Pittsburgh Parks Conservancy. Lyons served as chair of the Board of Directors of Early Warning Services, LLC, the owner and operator of Zelle and PAZE. Lyons graduated from the University of Pennsylvania.

Wafaa Mamilli joined the Board of Fiserv, Inc. in 2021. Ms. Mamilli serves as Executive Vice President, Group Chief Digital and Technology Officer of Roche, a biotechnology, pharmaceutical and diagnostics company. Prior to Roche, Mamilli served as Executive Vice President, Chief Digital & Technology Officer and Group President for China, Brazil and Precision Animal Health of Zoetis Inc. and led global technology, digital, analytics and cybersecurity teams powering business innovation, growth and customer experiences. Mamilli joined Zoetis from Eli Lilly and Company, where she spent more than 20 years in a variety of leadership positions including Global Business Units Chief Information Officer. As Eli Lilly’s first Chief Information Security Officer (CISO), she led the strategy and execution to secure digital products, devices, manufacturing systems and information across the business.

Heidi G. Miller joined the Fiserv Board of Directors in 2019 after serving on the Board of First Data since 2014. She is an accomplished senior executive in the financial services industry. Prior to retiring in 2012, Ms. Miller was president of JPMorgan International, a division of JPMorgan Chase & Co. Before that she served as CEO of JPMorgan Chase’s Treasury and Security Services, leading 35,000 people in 50 countries. Ms. Miller also served as executive vice president and chief financial officer for Bank One Corporation. She has held other CFO positions including at the Travelers Group and later at Citigroup.

Ms. Miller has an extensive background leading diverse companies and organizations. Ms. Miller currently serves as a director of Waystar, a leading provider of revenue cycle technology. Previously she served as a director of HSBC Holdings PLC from 2014 to 2021, General Mills Inc. from 1999 to 2019, Progressive Corp. from 2011 to 2014, and as a trustee of the International Financial Reporting Standards Foundation.

Ms. Miller was featured in American Banker's Most Powerful Women ranking from 2003-2010 and was No. 1 on the banking list from 2007-2009. In 2008, she topped Crain's list of the “50 Most Powerful Women in New York”.

Ms. Miller graduated from Princeton University with a bachelor’s degree in history and completed her doctorate in history at Yale University in 1979.

Doyle Simons is Chairman of the Board at Fiserv, Inc. In this role, he leads the Board of Directors in maximizing long-term shareholder value, ensuring the Company conducts its business in a highly ethical manner and creating an environment that respects and values all employees and promotes corporate responsibility. Simons, who joined the company's Board in 2007, most recently served as Lead Director from May 2022 until April 2025 before being appointed Chairman.

Simons brings extensive executive leadership experience to Fiserv, having served as President and Chief Executive Officer of Weyerhaeuser Company, a publicly traded timberlands and forest products company, from 2013 to 2018. Prior to Weyerhaeuser, he spent nearly two decades at Temple-Inland, Inc., a manufacturing company focused on corrugated packaging and building products, where he served various leadership positions rising to Chairman and Chief Executive Officer from 2007 until the company's acquisition in 2012.

In addition to his role at Fiserv, Simons currently serves as a director at Iron Mountain Incorporated, a storage and information management company and Union Pacific Corporation, a leading transportation Company. His leadership experience spans strategic planning, operational excellence, financial management and corporate governance across multiple industries. Simons holds a bachelor's degree from the University of Georgia and a Juris Doctor from the University of Texas School of Law.

Kevin M. Warren joined the Board of Fiserv, Inc. as a Director in 2020. From 2018 to 2023, Mr. Warren served as Executive Vice President and Chief Marketing & Customer Experience Officer at UPS, a publicly traded global logistics company. As a member of the company’s Executive Leadership Team, he was responsible for U.S. and International Marketing, The UPS Store, Digital Access Program, Revenue Enablement, Business Planning, Forecasting & Pricing, Digital Marketing, Customer Experience, Global Business Services and Brand Relevancy. In recognition of his leadership in the marketing industry, Mr. Warren was named to Forbes’ 2022 World’s Most Influential CMOs list and recognized by Adweek as a 2023 Brand Genius.

Prior to joining UPS, Mr. Warren spent 36 years at Xerox Corporation, most recently serving as Executive Vice President and Chief Commercial Officer. During his tenure, he held numerous leadership positions, including President of Global Growth Opportunities, Chairman and Chief Executive Officer of Xerox Canada and President of U.S Client Operations. He also served as a director of Illinois Tool Works, a Fortune 200 company, from 2010 to 2021.

Mr. Warren currently serves as a member of the Georgetown University board of directors and International Tennis Hall of Fame Board of Governors. He is also a member of the Executive Leadership Council and the Black Executive CMO Alliance.

Mr. Warren received his Bachelor of Science in finance from Georgetown University, and in 2007 completed the Advanced Management Program in Business/Commerce at Harvard Business School.

Charlotte Yarkoni is President of Commerce + Ecosystems (C+E) at Microsoft. In this role, she is responsible for driving accelerated cloud adoption and customer success for startups, enterprises, partners, and students. Her team supports all commerce experiences across Microsoft to help customers better discover, use, and pay for Microsoft’s offerings on Azure marketplace, AppSource marketplace, and all other commerce platforms. Her scope includes engaging partners and sales, as well as Microsoft Finance systems, and services and experiences that power Marketing, Microsoft Stores, Consulting Services and Customer Support. Yarkoni is also responsible for developer relations at Microsoft, building programs and platforms that support developers to help them gain proficiency by delivering content and resources to build digital skills.

Prior to joining Microsoft, Yarkoni spent three years at Telstra as President-Telstra Software Group. This strategic growth division focused on new global software businesses and capabilities in markets experiencing digital disruption adjacent to Telstra’s core telecommunications industry. Previously, she held senior vice president positions at EMC and VMware, leading developers of IT infrastructure technology and solutions.

She has an extensive background in cloud-based applications and has held C-level roles for both public and privately held technology firms including CEO of a high-tech startup. Yarkoni has also worked for AT&T, IBM, and Accenture.

She earned her bachelor's degree in Management Science from Georgia Institute of Technology, and previously served as Vice Chairman at Ooyala and as a Board Director of the Seattle Humane Society.