He was also the head coach of the Pattonville High School in Maryland Heights, Missourivarsity football team's first run at the state championship in 2001. He was the head coach of the Pattonville "Pirates" for 14 seasons. During that time, he led the Pirates to 13 district titles, four Suburban North Titles, eight Sectional Titles and three appearances in the state semifinals. Three of his teams finished the regular season undefeated. Greco's 2000 "Pirate" team made an appearance in the "Show Me Bowl", but fell short of a state crown. During his 14 seasons, he established the longest tenure and the winningest record in the history of the Pattonville Program, (119-45). The St. Louis Post-Dispatch, the St. Louis Rams and the National Football Foundation have named Greco "Coach of the Year". In 2001, he served as defensive coordinator for the River City Renegades of the Indoor Professional Football League. Greco has done work on local cable television as a color commentator for the, St. Louis "Believers" and "Rage" Indoor Football Teams. He is a member of the St. Louis Post-Dispatch "All Millennium Team", selected in December 1999. In 2011, Greco was inducted into the St. Louis Football Coaches Hall of Fame. He is a published author. He has written two books detailing the history of high school football in the St. Louis area.
