CHICAGO — Richard Trojan has joined The HallStar Co.’s senior management team as Vice President, Human Resources and Corporate Services. In this position, Trojan will be responsible for human resources, regulatory affairs, quality assurance and safety. He replaces Keith Carlson, Vice President, who will retire from the specialty chemical company this year after more than 12 years of service.

The HallStar Co. is a privately held corporation that focuses on providing innovative chemical solutions for its customers in more than 50 countries across six continents.