Possible Clues:

• "Wise Guys" co-star Joe
• 1980s "SNL" regular
• Joe who in the '80s had a comedy special on HBO
• Sinatra portrayer on 'S.N.L.'
• Sinatra impersonator on 'S.N.L.'
• Early 80's 'S.N.L.' comic
• Former 'S.N.L.' comic
• Onetime Sinatra impersonator