Michael B. Petras, Jr. has been appointed chief executive officer of Sterigenics International, effective June 20, 2016.  Mr. Petras succeeds Michael Mulhern, who has been appointed to serve as executive chairman of the Sterigenics board of directors. Mr. Petras has more than 25 years of leadership experience, most recently serving as president of Cardinal Health’s Post-Acute Solutions businesses. Prior to that he was chief executive officer for AssuraMed, a medical products supplier, ...