John Decker is an NFL Players Association (NFLPA) Certified Contract Advisor and the founder of J Decker Sports, a boutique sports agency based in Grosse Pointe Farms, Michigan. Certified by the NFLPA since 2019, he provides professional football players with contract negotiation, endorsement, legal, and marketing services. Through his agency, Decker focuses on delivering personalized representation while helping athletes navigate both the business and legal aspects of their professional careers. As the principal of J Decker Sports, Decker emphasizes a client-centered approach built on accessibility, individualized guidance, and long-term career planning. His services extend beyond negotiating NFL contracts to include endorsement opportunities, legal counsel, and brand development, allowing athletes to maximize their opportunities both on and off the field. Although J Decker Sports operates as a smaller agency, Decker has established himself as an NFLPA-certified representative committed to providing comprehensive support tailored to each client's needs. His practice reflects the personalized attention often associated with boutique agencies, enabling him to work closely with players throughout every stage of their professional careers while advocating for their financial and career interests.