Executive management

David Risher

Chief Executive Officer and Director

Mr. Risher has served as our Chief Executive Officer since April 2023 and as a member of our board of directors since July 2021. Mr. Risher co-founded Worldreader, a non-profit organization, and served as its Chief Executive Officer from November 2009 until April 2023, as Board President from March 2010 until April 2023 and as Board Founding Chair since April 2023. Prior to Worldreader, Mr. Risher served as Senior Vice President, US Retail at Amazon.com, Inc. (“Amazon”), an e-commerce company. Prior to joining Amazon, he served as a General Manager at Microsoft Corporation, a software company. Mr. Risher currently serves on the boards of directors of several privately-held and non-profit companies. Mr. Risher holds a B.A. in Comparative Literature from Princeton University, an M.B.A. from Harvard Business School and an honorary Ph.D. from Wilson College.

Erin Brewer

Chief Financial Officer

Ms. Brewer has served as our Chief Financial Officer since July 2023. From May 2020 to October 2022, Ms. Brewer served as Managing Director Enterprise Finance at Charles Schwab & Co., Inc., a financial services company. From September 2018 to April 2020, Ms. Brewer served as Head of Strategy and Finance at Atlassian Corporation, a software development company. Previously, Ms. Brewer served in a variety of roles for McKesson Corporation from August 2005 to July 2018, most recently as EVP and Chief Accounting Officer from 2016 to 2018 and before that in a variety of senior investor relations, financial planning and analysis, and finance roles. Ms. Brewer also served as a board member for McKesson Ventures from 2016 to 2018. Ms. Brewer holds a B.S. in Accounting from Purdue University and an M.B.A. from the Haas School of Business at the University of California, Berkeley.

Lindsay Llewellyn

Chief Legal and Business Officer

Ms. Llewellyn has served as our Chief Legal and Business Officer, Corporate Secretary since July 2025. She previously served as our Chief Legal Officer and Secretary from July 2024 to July 2025, as our General Counsel and Secretary from November 2021 to July 2024, as our acting General Counsel from January 2021 to June 2021, as our Vice President, Associate General Counsel from June 2021 to November 2021 and from March 2017 to December 2020, as our Managing Counsel, Litigation from August 2015 to March 2017, and as our Litigation Counsel from September 2014 to August 2015. From 2008 to 2014, Ms. Llewellyn served as an associate at Winston & Strawn LLP, a law firm. Ms. Llewellyn holds a B.A. in Political Science and Communications from the University of Southern California and a J.D. from the University of California, College of the Law, San Francisco (formerly University of California, Hastings College of Law).