Brennan has  worked with multi-platinum award-winning record producers David Bendeth and Melanie Andrews, Grammy award winning engineer Phil Allen, Multi-Platinum producer and mixer Warren Huart, and Multi-Platinum Oscar and Grammy Nominated producer Ronnie King. He has also provided foley and sound effects for various podcasts, documentaries, and animated shorts. Brennan also teaches within the Digital Media Arts department at Cal State Dominguez Hills, providing instruction in audio production.