Jim Callahan - is a video game composer. Jim Callahan began his career in 2003 and has worked for companies such as PopTop and 2K Games. Jim Callahan's first game was Railroad Tycoon 3 which was released 20 years ago. Best Game Jim Callahan contributed to was Railroad Tycoon 3. Jim Callahan's latest work is Railroad Tycoon 3 which was released 20 years ago.