He is known for his roles as Scott Chandler on All My Children, Matt Durning on Beverly Hills, 90210, Bill Lewis on Guiding Light, Christopher Hughes II on As the World Turns and Aiden Jennings on Days of Our Lives.
Cosgrove has been a cast member during the series finale of three consecutive cancelled soap operas: Guiding Light, As the World Turns, and All My Children.
That same year, Cosgrove moved to Los Angeles to take the role of Matt Durning on Beverly Hills, 90210, where he remained until the show ended in 2000.
In June 2002, he moved back to New York to join the cast of Guiding Light as Bill Lewis III, leaving the show in October 2005 after opting not to renew his contract.
Cosgrove has been a cast member during the series finale of three consecutive cancelled soap operas: Guiding Light, As the World Turns, and All My Children.