Colligan joined Authorware Inc. in 1989 and was its president and CEO when it merged with MacroMind-Paracomp to form Macromedia. He served as the first president and COO of the combined company. Colligan took over CEO duties from Tim Mott on January 1, 1993. He stepped down as CEO in 1997. He was also chairman of the board of Macromedia from 1994 until 1998.