"Les Snead is a rising personnel star whose passion for scouting and innovation differentiated him throughout the search process," Rams Chief Operating Officer Kevin Demoff said in a statement.
"His vision for making the Rams a sustained winner resonated with our entire organization and the energy and leadership he brings to our building is infectious. He has spent 15 years preparing for this opportunity and we are confident he will deliver the results our organization and fans deserve."
Snead, who worked for the Jacksonville Jaguars from 1995-97, was in the Falcons' front office for the past 13 seasons working in the personnel department. He will have final say in personnel decisions for the Rams, the team said.