Rilio Mastrantonio graduated from Hamline University School of Law in 1989 with a Law Degree (Juris Doctor). While at Hamline he competed on the Hamline Crew Team. Additionally, he attended University of Illinois, Champaign-Urbana from 1982 to 1986 and earned a Bachelor of Arts Degree in History and Sociology (Double Major).

Additionally, Rilio has over 25 years in contract negotiation, sales, and marketing in the corporate sector which he brings to bear when representing players. His experience gives him the tools to create ideal situations for his players in the marketing and contract negotiation areas.