Was Alan Freed was the most important independent record producer in 1950s?

No, Ahmet Ertegun was the most important independent record producer in the 1950s. He was the co-founder of Atlantic Records, which became one of the most successful record labels of the era. Ertegun produced some of the most iconic recordings of the time, including Ray Charles' "What'd I Say" and Otis Redding's "(Sittin' On) The Dock of the Bay."