date:Apr 15, 2013
nd most recently was director of advanced train control.
Sionix Corp., Houston, Texas
Dr. Henry Sullivan was appointed chief executive officer and chairman of the board of directors. Sullivan has been a director of Sionix since October 2012, and he has been active in the technical and operating management of the company since.
ATMI, Inc., Danbury, Conn.
Robert Hillas, a member of the board of directors and chairman of the audit committee, announced his retirement, effective May 2013. Hillas ha