Derek started his acting career in 2009, starring in several minor roles in TV series such as The Middle, Cougar Town, and The Hills. He also auditioned for Captain America but was not cast.
In 2012, Theler landed his first recurring role when he was cast in the ABC Family comedy, Baby Daddy, playing Danny Wheeler, the brother (and roommate) of a guy who finds out he is a father when someone drops a baby off on their doorstep.
In between acting gigs, Theler appeared as a model in TV commercials. He first landed the coveted "Coke Zero" Commercial in 2009. This then followed by a campaign for "State Farm”", in which he played a hot guy who is 'sensitive' and has a
Aside from acting, he was also the writer and executive producer of a short film called Intrusion.
For fun, Theler enjoys playing football, swimming and riding his motorcycle.