Paul Villotti has joined Henderson Engineers as its director of life safety. With 35 years of experience in fire protection and life safety, Villotti is widely recognized as a leading expert in the field.

HDR has promoted Bernie Arseneau to director of its highways and roads unit in Minneapolis.

Tom Marquardt has joined HOK’s Chicago office as vice president and director of interiors.

John Hilmes has joined Byrne & Jones Construction in Bridgeton, Mo., to serve as its chief financial officer.

Michael Steffen has joined HNTB Corp.’s Kansas City, Mo., office as senior systems project manager, specializing in positive train control.

Midwest construction industry veteran Gary Thalheimer is the new vice president, general manager in Gilbane Building Co.’s Chicago office.

Jerry Harmon has been promoted by ACME Constructors Inc. to the position of vice president of operations.

Gene Sieve has been promoted to vice president of the Minneapolis-St. Paul office of Burns & McDonnell.