Thomas scored 15 goals in helping Harvard to its first undefeated regular season, the 12-0 squad of 1969. In 1970, his goal against Yale gave the Crimson a 1-0 win and preserved a second straight unbeaten year. In that year’s NCAA Tournament, Thomas netted four goals in a 6-0 win over Worcester Tech and scored both goals in a 2-1 victory over Brown.