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ATMI board member Robert Hillas to retire in May

DANBURY, Conn. (AP) -- ATMI Inc. said Tuesday that longtime board member Robert S. Hillas will retire at the end of his current term in May.

The Danbury, Conn.-based company said that he helped guide ATMI from a start-up to the global technology company that it is today. Hillas has served as a director of ATMI since 1987, making him one of the company's earliest directors. He served on the board's audit and compensation committees.

Hillas earned $177,533 as a board member in 2011, according to a regulatory filing. The company has not yet filed compensation data for 2012.

ATMI, which makes specialty semiconductor materials, did not immediately name a replacement.

Shares of the company slipped 26 cents to $21.51 by midday.