Sim was the general manager of ABSI from 2001 to 2019. He retired in 2019 and has since worked as a consultant for ABSI's large group of clients. Prior to joining ABSI, Sim worked as the Senior VP/CIO for GEICO as well as COO for BlueCross BlueShield of the National Capital Area. Sim served in the U.S. Marine Corps and holds a M.S. in Business Administration from George Washington University.