Ms. Callahan is an Operating Partner on the Healthcare team, having joined WCAS in 2023. Ms. Callahan is an accomplished executive with 25 years of experience leading and growing HCIT companies. Before joining WCAS, Ms. Callahan served as the Chief Operating Officer of Twill, overseeing all commercial, clinical, and people functions. Under her leadership, she achieved a significant increase in contracted annual recurring revenue by enhancing sales leadership and crafting an innovative go-to-market strategy. Prior to Twill, Ms. Callahan was the President of Lyft Healthcare, Inc., where she drove robust growth and improved access to healthcare for the 5.4 million people who miss healthcare appointments every year because of a lack of transportation. Prior to Lyft, Ms. Callahan served as Chief Strategy Officer for Change Healthcare, and SVP of corporate strategy and business development for McKesson Technology Solutions. She is on the board of digital health companies Reveleer and Kinetik and advises several HCIT start-ups.