Brook has been involved in the performance marketing space since 2000. He is co-founder of two companies, Schaaf-PartnerCentric (founded 2006, sold 2017) and FMTC.co (founded 2007). He is an active member of Entrepreneurs' Organization in Austin. His book "The Affiliate Hypothesis: Universal Link Monetization to Save the Open Web" will be published in November, 2026.