MORRISVILLE,Mark Sirgo, who joined BioDelivery Sciences (BDSI) when it acquired Morrsville-based Arius Pharmaceuticals, is the new president of BDSI.

The company announced Sirgo’s promotion on Monday. He retains his chief operating officer duties. Sirgo was named senior vice president of commercialization and corporate development after the Arius acquisition.

Francis O’Donnell, chairman and CEO of BDSI, will relinquish his role as president, the company said.

Sirgo will continue to be based in North Carolina, the company added.

BDSI is based in Newark, NJ.