As he walks to the stage of a Hofstra University lecture hall, Robert Leonard’s attire is every bit the college professor: blue blazer and shirt, charcoal slacks, yellow tie, glasses.

He’s a long, long way from the summer of 1969 when the uniform of the day was a gold lam� jumpsuit. Leonard was a founding member and bassist for Sha Na Na, a zany doo-wop group that played one of its first gigs at Woodstock.