Wissenswertes

Strong aficionado for USA-made muscle cars; he had six as of the last count.

His sister, Michelle Casey, was in an episode of Eine himmlische Familie (1996) with him ("With a Little Help From My Friends").

Graduated from the University of Southern California's School of Cinema-Television (Cinema Critical Studies) in 2007.

The middle child of five siblings born to Darren James Gallagher and Elena Lopez (of Irish and Cuban backgrounds, respectively) and a stepson of Vincent Casey, David Gallagher has two younger brothers, Killian (who is autistic, which is why David is a devoted member and spokesperson of the organization CAN/Cure Autism Now) and Kyle Casey and two younger sisters, Michelle Casey and Kelly Casey.

Decided not to return for the 11 season of 7th Heaven, on the CW Network (Juni 2006)

He has been in two movies with John Travolta: Kuck' mal wer da jetzt spricht! (1993) and Phenomenon - Das Unmögliche wird wahr (1996).

He is a week older than actor Jake Richardson who played Johnny Morton in the episode Johnny Get Your Gun (1998).