At the age of two, David Gallacher worked for print advertisements in around New York City. After that, Gallagher appeared in numerous television commercials like Tyson Foods, Fisher Price, and much more. Gallacher has featured in multiple commercials and print advertisement before entered into the television industry.
Afterward, David took his step in an American romantic comedy movie, "Look Who’s Talking Now" as Mickey Ubriacco. Following, Gallacher appeared in numerous films including, Little Secrets, Super 8, Phenomenon, Boogeyman 2, The Quiet, Kart Racer, Trophy Kids, Summer of Fear, Betwixt and so on.
In 1996, David Gallagher appeared in an American television drama series, "7th Heaven" as Simon Camden, through which he earned the name and fame. Then after, David portrayed in various television series such as Walker, Texas Ranger, Rocket Power, The Wild Thornberrys, Numb3rs, Saving Grace, The Deep End and so on.
From his acting career, David succeeded to honored with five times ''Young Artist Award'' and ''Teen Choice Award''. Apart from this, David also appeared in a video game, Kingdom Hearts.
Moving towards his personal life, David Gallagher dated numbers of famous personalities. He dated his ex-girlfriend, Megan Fox in 2003 and separated after a year of their relationship. Later, David involved in a love affair with his ex-girlfriend, Shannon Woodward; however, his second love also last for a year only.
Similarly, David started dating, Jillian Grace; however, like his previous relationships, his encounter with Jillian also remained for a short time. Till this date, David is unmarried.
David belongs to the white ethnicity and holds an American nationality. He earns an impressive amount of salary, and as of 2017, David has a net worth of $3 million.