Long-serving sales executive Don Colleran will become president and CEO of FedEx Express on March 16, replacing Raj Subramaniam who has been promoted to FedEx Corp COO. The move means FedEx Express will have its third boss in four months. David Cunningham retired from the post in December after less than two years, and Subramanian took over the job on January 1 this year. But he was appointed group COO last month following the surprise retirement of Dave Bronczek as of February 28, although it was stated that he would also retain the FedEx Express CEO role.