Chromatin Inc., of Chicago, promoted Daphne Preuss to president. Roger Ganser, acting CEO, has retired and will continue as chairman of the board of directors. Chromatin also appointed Caroline Kovac and John Hamer to its board of directors.

Cowen Group Inc., of New York, named Rachel McMinn a senior analyst.

Critical Biologics Corp., of Cambridge, Mass., appointed Richard Straube chief medical officer.

EnWave Corp., of Vancouver, British Columbia, has added Paul MacNeillto as its senior management for legal and corporate affairs; Paul Reinhart as executive communications advisor; Parastoo Yaghmaee, as a scientific advisor; and Steve Leptick as a product development advisor.

EPIX Pharmaceuticals Inc., of Lexington, Mass., appointed Sheila DeWitt vice president of discovery, Tom Megerian executive director of clinical research, Sharon Shacham vice president of drug development and Simon Jones vice president of biology and ADMET.

InNexus Biotechnology Inc., of Vancouver, British Columbia, added Ellen Vitetta to its scientific advisory board.

Iroko Pharmaceuticals, of Philadelphia, appointed Susan F. Langer chief medical officer and vice president of research and development

Juvaris BioTherapeutics, of Leasanton, Calif., added Lewis T. "Rusty" Williams to its board of directors.

KaloBios Pharmaceuticals Inc., of Palo Alto, Calif., named Tillman Pearce chief medical officer, and Carmen M. Betancourt, senior vice president of regulatory affairs, quality and project management.

MDS Pharma Services, of King of Prussia, Pa., named Todd Johnson senior vice president for strategy and corporate development.

MedImmune, of Gaithersburg, Md., named Patricia Winter Cash as senior director of research and development.

Metabolix Inc., of Cambridge, Mass., named George Kipouras and Kristin Taylor business development managers, and Debra Darby brand director.

MIV Therapeutics, of Atlanta, added Greg Kaluza to its scientific advisory board.

Novalar Pharmaceuticals, of San Diego, appointed Diana Friedman vice president of marketing.

Nucryst Pharmaceuticals Corp., of Wakefield, Mass., appointed Edward Gaj Jr. vice president of corporate development.

OSI Pharmaceuticals Inc., of Melville, N.Y., named Kenneth B. Lee Jr. to its board of directors.

Osprey Pharmaceuticals Ltd., of Montreal, named Barbara K. Finckas senior vice president and chief medical officer.

Peplin Ltd., of Emeryville, Calif., appointed George W. Mahaffey chief commercial officer and vice president of sales and marketing.

Pluristem Life Systems Inc., of New York, named Frank Carlucci chairman of its strategic business advisory board.