Advanced Magnetics Inc., of Cambridge, Mass., appointed Jerome Goldstein executive chairman and named Brian J.G. Pereira CEO.

Affitech, of Oslo, Norway, named Hans Petter Tjeldflaat as director of finance and Rathin Das as senior vice president of corporate development and chief business officer.

Alexza Pharmaceuticals Inc., of Palo Alto, Calif., added Joseph Baker as vice president, commercial manufacturing and global supply chain.

Aradigm Corp., of Hayward, Calif., appointed John Siebert to the board.

ARCA Discovery, of Denver, named Dick Brewer president, CEO and member of the board.

AtheroGenics Inc., of Atlanta, named Christopher Prue vice president, regulatory affairs.

Enzo Biochem Inc., of New York, appointed Gary Cupit president of Enzo Therapeutics Inc.

Halozyme Therapeutics Inc., of San Diego, named William Fallon vice president, manufacturing and operations.

ImaRx Therapeutics Inc., of Tucson, Ariz., named Bradford Zakes president and CEO.