Haythe was senior partner of New York firm, Haythe Curley which recently merged with Canada's Tory Tory DesLauriers & Binnington to form the 300-lawyer firm, Tory Hathe.
It has not been revealed exactly what Haythe did at the party on 19 November, although a firm spokesman says his actions were directed against "more than one lawyer in the firm".
He adds that the behaviour was "inappropriate" and violated the firm's policy against sexual harassment.
The firm is now understood to be looking for a new name since the loss of one of its name partners. It is also considering whether it needs to report to report Haythe to the New York State Bar