Stephen Stills ( January 3 , 1945 - ) is an American singer and songwriter . He is most famous as a member of the groups Buffalo Springfield and Crosby , Stills & Nash .
Stephen Arthur Stills ( born January 3 , 1945 ; Dallas , Texas ) is an American guitarist and singer\/songwriter best known for his work with Buffalo Springfield and Crosby , Stills & Nash ( and Young ) .