A number of staffing changes have occurred at 4M Building Solutions, a St. Louis-based building service contractor servicing the Midwest, Southeastern and Northeastern United States.

Karl Thorpe, Nicholas Blackburn, Roberto Mejia and Herlinda Cruz recently joined 4M Building Solutions, assuming the role of account manager. Yohanny Castro has joined as regional coordinator.

Mariana Rodriguez, Maria Oliver and Monica Montoya have been promoted to account manager. Carlos Berganza has been promoted to field manager.

“It’s an exciting time at 4M with our growth and we look forward to the immediate success, growth and further development of these team members” says Tim M. Murch, chairman and CEO of 4M Building Solutions.