Since starting his design education, Brennan has worked with company sponsors, including Xenith Football and The United States Olympic National Luge Team, which he developed footwear designs for both brands. In January 2019, he interned with 360 Fly, an action camera company, and Kohler Company the following summer. He cites these two internships as key influential experiences in his design education. Brennan is an open-minded designer with a broad skill set, ranging from the graphic typography skills he learned in his Communication Design minor, and filmmaking from classes he took as bonus electives. He is a strong communicator and is always eager to learn new skills in service of creating beautiful work.