Board of Directors

Board of Directors

Mike Rosenbaum
Chief Executive Officer

Mike Rosenbaum

Mike Rosenbaum joined Guidewire as Chief Executive Officer in 2019. Since Mike’s arrival, Guidewire has cemented its position as the leading cloud platform serving the P&C insurance industry, growing cloud adoption by over 500%, tripling cloud revenue, and expanding the Guidewire partner ecosystem to become the largest in P&C insurance. 

Mike’s focus on delivering value for customers, coupled with his “ship, shipmate, self” approach to prioritization, continue to shape the industry-leading platform, applications, and content trusted by insurers globally. Prior to Guidewire, Mike led product management and go-to-market strategy for core CRM products at Salesforce and served in the US Navy as a submarine officer.

Marcus S. Ryu
Co-founder and Chairman

Marcus Marcus has served as Guidewire’s Chairman of the Board of Directors since August 2019, contributing to the company’s strategy and furthering key customer and industry relationships. Since cofounding Guidewire in 2001, he has held many roles, including leading the product, marketing, sales, and services teams. Most recently, Marcus served as CEO from 2010 to 2019, leading Guidewire through its IPO in 2012. During his tenure as CEO, Guidewire became the market-leading provider of mission-critical applications to P&C insurers. Before cofounding Guidewire, he was Vice President of Strategy at Ariba and an Engagement Manager at McKinsey & Company..

Paul Lavin

Paul Paul has served on Guidewire’s board of directors since 2014 and as Lead Independent Director since August 2019. Paul is also the Executive Director of both American Health Holding and First Health Network, which are leading health insurance–related companies and subsidiaries of Aetna, positions he has held since 2008 and 2017, respectively. Prior to joining Aetna, Paul was a Managing Director at KPMG Consulting/BearingPoint, where his focus was on financial services, primarily insurance. He was formerly a Senior Vice President at Prudential, an executive at Alexander & Alexander, a Principal at Mercer Management Consulting, and an auditor at PricewaterhouseCoopers.

David Bauer
DavidBauerDavid has served on Guidewire’s board of directors since October 2022. He currently serves as Managing Partner and Co-Founder of Holding Ground Decision Intelligence LLC, which provides strategic technology assessment and diligence services for investment companies, boards, and executives, a position he has held since January 2020. From November 2014 to January 2020, David served as Managing Partner at Sand Hill East LLP, and provided early-stage companies with go-to-market, product, security, technology, and operations advisory services. He also previously served as CTO at Asurion, and CISO at Morgan Stanley and Merrill Lynch.
Margaret Dillon

Margaret Dillon Margie has served on Guidewire’s board of directors since 2019. From December 1993 to September 2017, she held various executive positions at Liberty Mutual Insurance Company, including Senior Vice President and Chief Financial Officer, Personal Insurance, and Executive Vice President and Chief Customer Officer, US Consumer Markets. Since May 2021, Margie has also served on the board of directors of White Mountains Insurance Group, Ltd.

Michael Keller

Michael Keller Mike has served on Guidewire’s board of directors since 2019. He is currently a consultant for MCK Consultants, an organization that he owns and is the principal of, which focuses on technology solutions for the insurance and financial services industries. Since April 2019, he has served as chairman of the company’s customer Strategic Advisory Councils. From June 2001 to June 2018, Mike was the Executive Vice President and Chief Information Officer at Nationwide Insurance and Financial Services. From January 1998 to May 2001, he served as Chief Technology Officer at JPMorgan Chase & Co. (formerly Bank One).

Catherine Lego

Catherine Lego Cathy has served on Guidewire’s board of directors since 2019. She is also a member of the boards of directors of Cirrus Logic Inc., IPG Photonics, and Lam Research. From 2013 to 2016, Cathy was a member of the board of directors of Fairchild Semiconductor International, and from 1989 to 2002 and 2004 to 2016 she was a member of the board of directors of SanDisk. From June 1992 to December 2018, Cathy was an angel investor and financial consultant to early-stage technology companies via her company Lego Ventures, where she served as the principal. Cathy previously practiced as a CPA with Coopers & Lybrand (now PricewaterhouseCoopers).

Rajani Ramanathan

Rajani Ramanathan Rajani has served on Guidewire’s board of directors since June 2021. She is currently an advisor/investor and director to several private technology companies in the AI, VR, blockchain, IMU/sensor, BIM, and connected (IoT) technology space. Since June 2014, she has served as a member of the board of directors of ESI Group, a French publicly traded company that provides virtual prototyping software solutions and services, and she chairs their Technology and Marketing committee. From June 2000 to March 2014, Rajani held a variety of leadership roles at Salesforce, most recently Chief Operating Officer and Executive Vice President – Technology and Products. .