Sirna Therapeutics said this week that Nassim Usman, senior vice president and COO, is leaving the company to pursue other interests.
Sirna also announced that Barry Polisky, vice president of research, has also been named CSO.
Polisky joined Sirna in 2002 from NeXstar Pharmaceuticals, where he was vice president of research.
Fisher Scientific said this week that Mark Roellig has joined the company as vice president, general counsel, and secretary.
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