David Johnson is a Partner and co-Founder of Caligan Partners LP, an SEC-registered investment manager. Previously, Mr. Johnson was a Managing Director at The Carlyle Group, where he was employed from 2010 to 2017. Prior to joining Carlyle, Mr. Johnson worked for six years at Morgan Stanley, where he was a Vice President in the Principal Investments area. Mr. Johnson was previously a director of AMAG Pharmaceuticals from October 2019 through November 2020. Mr. Johnson has served on the Executive Committee for the Harvard College Fund and is a member of the board of directors of the Children's Scholarship Fund. Mr. Johnson received his A.B. in Applied Mathematics, cum laude, from Harvard College in 2004 and a S.M. in Applied Mathematics from Harvard College in 2004.