Caplan has appeared on Broadway in Rent as Mark Cohen, in the revival of South Pacific and in High Fidelity.

[1] He has also been featured in the films Across the Universe and Painting Abby Long, and on the television show New Amsterdam.

[4] Caplan appeared in the original cast of the new Broadway musical Spider-Man: Turn Off the Dark, in many roles, among them, school bully Flash Thompson.

Aside from his roles on Broadway, Caplan has also done voice-over in English dubs of anime at NYAV Post.

He has been married to actress Rebecca Mozo since October 2016 and they currently reside in Los Angeles.