OSI Pharmaceuticals Inc., of Uniondale, N.Y., said Nicholas Bacopoulos joined the company as president and head of research and development.

Pherin Pharmaceuticals Inc., of Menlo Park, Calif., said Gary Petersmeyer was named president and chief operating officer.

Phylos Inc., of Lexington, Mass., made Gustav Christensen CEO.

SpectRx Inc., of Norcross, Ga., named Chris Monahan to its board of directors.