David Gallagher or David Lee Gallagher (born February 9, 1985) is an American actor. He is best known for the role of Simon Camden on the long running television series 7th Heaven and Mikey Ubriacco in the 1993 film Look Who's Talking Now.
Gallagher began acting at the age of 2, appearing in print ads in and around New York City which eventually led to commercial work. His film debut came in 1993 when he won the role of Mikey in the sequel Look Who's Talking Now. In 1995 he played in a production of A Christmas Carol on Broadway. He also starred in several TV movies, including Bermuda Triangle.
In 1996 he reunited with John Travolta for the movie Phenomenon. Later that year, David Gallagher was cast as Simon Camden in the family drama series 7th Heaven.
He filmed a few movies during hiatuses from filming, including the direct-to-video Richie Rich's Christmas Wish and Little Secrets with Evan Rachel Wood. In 2005 David starred in and co-produced a low-budget adaptation of The Picture of Dorian Gray.
His first role after leaving 7th Heaven was a guest stint on Numb3rs. He also appeared in the season 6 opener of CSI: Miami, and starred in the horror sequel Boogeyman 2.
He's also notable for having voiced Riku in the Kingdom Hearts video game franchise and for portraying Seiji Amasawa in the English dub version of Studio Ghibli's Whisper of the Heart. He appeared on the second-to-last episode of the series The Deep End, where he played a man charged with second-degree murder although he is innocent.