 Klein was a partner in the law firm Klein, Calderoni & Santucci, LLP, but divested from the law practice in 2015 and continued to call for lawmakers to give up their outside income.In January 2018, Klein was accused by a female former staffer of having forcibly kissed her in 2015; Klein denied the accusation and immediately called for an investigation of the allegation.Despite the allegations, Klein took part in high-level negotiations regarding sexual harassment legislation in 2018.