Brennan is also one of the celebrities who love to keep his personal profile low and secret. Till date there is no any information about his love affairs, girlfriend and break up. His nationality is American and she is of white ethnicity. He is now aged 20 years old.
Brennan grew up in a musical background. His uncle Jeremy Fransen is also a drummer and he drummed in a '90s punk band called Stratego. His elder brother Tyler Benko is a guitarist and a vocalist. They were his inspiration in music. He began playing drums when he was aged nine years old. He also began writing music with his brother. The two brothers formed an indie rock band False Puppet in 2009. He served as the lead drummer of this band and his brother did the vocal and the guitar. Their debut album called Gibraltar was released in 2015. His net worth is unknown.