Mark K. Schonfeld, 44, oversees nearly 400 enforcement attorneys, accountants, investigators and compliance examiners as director of the New York regional office of the Securities and Exchange Commission.

A graduate of Harvard Law School and a former private litigator, he began working for the commission in 1996 as a staff attorney in its Boston office. He came to New York two years later, and was named Northeast regional director in 2004.