Misonix Inc. appointed Stavros Vizirgianakis as CEO and president, effective Dec. 19.

Vizirgianakis has served as the company's interim CEO since September and as a member of the board since May 2013. He is also Misonix's largest shareholder.

In October, Vizirgianakis invested $4 million through the purchase from the company of 761,469 common shares in a private placement at a price of $5.253 per share. After closing of the acquisition of these shares, he became the company's largest shareholder.

In addition, T. Guy Minetti resigned as a board member of the company.