During these years he played with guitarists John Fahey, Bukka White, Son House, and Jo Ann Kelly.
[3] He hosted and co-produced the On Patriots' Stage concert series in Trenton, New Jersey, performed at the Metropolitan Museum as part of the Guitar Heroes exhibition in 2011,[4] and played clubs and festivals throughout the world.
From 1981–2000, he was a faculty member at the New School in New York, teaching jazz improvisation, music theory, and acoustic blues and ragtime guitar.
In 1999, Mann established Acoustic Sessions, a corporation that works in music production for television and films.
He was the co-producer and musical supervisor for the documentary Harlem Street Singer, the story of Reverend Gary Davis.