His first band Blue Ruin (2) - Don't Come Home issued a record produced by Billy Rath.
He has shared the stage with artists such as Johnny Thunders, Rick Derringer, Johnny Winter, Nazareth or Jon Spencer, and has done some time with the underground in London and New York.
Back in New York in the early 90s Greg formed a group with Jerry Nolan of the New York Dolls and ''Chicago Vin'' Earnshaw of the Delinquents. Their recordings at Baby Monster Studios were brought to an end by Nolan’s untimely death. Greg then formed the Jigsaw Men and later the Greg Allen Group with Johnny Ráo.