He continues as a Senior Advisor to and board member of GTHX. Previously, Mark was Executive Vice President at the Leukemia & Lymphoma Society (LLS). Prior to LLS, Mark was a co-founder and Senior Vice President of CGI Pharmaceuticals, where he managed the company from its inception through clinical trials of multiple drug candidates. After Gilead Sciences acquired CGI, he served as a Senior Advisor to Gilead in R&D Strategy and Corporate Development.