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Bharat Chowrira, Michael Hogan, Lynda Merrill, Marc Casper

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Bharat Chowrira has joined Nektar Therapeutics as COO and head of the company’s pegylation business unit.
 
Chowrira was previously executive director of worldwide licensing and external research at Merck. He also served as a vice president at Sirna Therapeutics, which was acquired by Merck. Before the acquisition, he was vice president of legal affairs and patent counsel for Sirna.
 
At Nektar, Chowrira will report to President and CEO Howard Robin, who had been the president and CEO of Sirna prior to the acquisition.
 

 
Sigma-Aldrich’s chief administrative officer and chief financial officer Michael Hogan plans to retire sometime this summer after the company names his successor, Sigma-Aldrich said this week.
 
Hogan said he is leaving the company to pursue volunteer and civic activities. The company is searching for his replacement.
 

 
Qiagen has named Lynda Merrill as vice president of molecular diagnostics sales for Europe, Middle East, Africa, and Australia.
 
Merrill, who will be based in the UK, formerly was a vice president at Gen-Probe. She also served in management roles at Boehringer Mannheim.
 

 
Thermo Fisher Scientific has promoted Marc Casper to the post of chief operating officer, a new position at the company.
 
Casper formerly was Thermo Fisher’s president of Analytical Technologies. He started with the company in 2001 as Life Sciences president, and he formerly was CEO and director of Kendro Laboratory Products.
 
He also had been president of the Americas region for Dade Behring, and he was a strategy consultant at Bain & Company.

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