1. Daniel Todd Gilbert (USA, b. 1957) who wrote Stumbling on Happiness.
2. Gilbert, Daniel guitarist did write Guitar Soloing : The Contemporary Guide to Improvisation.
3. Dan (Daniel) Gilbert (USA, b. 1979, web developer, a graphic artist, and a cinematographer) wrote Hacking World of Warcraft.
4. Daniel Gilbert, science fiction author of short stories and essays, Meat box, Kokomu, Bibliography at isfdb.org
5. Daniel Gilbert, photographer - Laos