Protos Security, a managed services security guarding provider and a portfolio company of Southfield Capital, has hired Mark Hjelle as chief executive officer and a member of the board.

Hjelle has led private equity-backed national business and facility services firms for nearly 25 years, delivering strong top-and-bottom-line growth and building high-performing teams with strong culture. Most recently, Mark was CEO for CSC ServiceWorks where he led the development of a digital platform that helped consumer-driven revenue growth and services extensions. Prior to CSC, Hjelle was president of Brickman/Valleycrest where he led over 20,000 team members across 250 branch offices.

“Now is the right time for a leader with Mark’s experience to help further accelerate Protos’ growth and to continue to make the right investments in the platform, team and technology to extend Protos’ innovative leadership position in the security space,” says Andy Levison, managing partner at Southfield Capital.