Pittsburgh-based IT staffing firm Mastech Holdings Inc. (NYSE MKT: MHH) announced D. Kevin Horner resigned as president and CEO and director of the board. Mastech’s board appointed Vivek Gupta as his successor in these roles, effective March 1.

Horner is included in the Staffing 100 list of influential people in the industry. He joined Mastech as CEO in October 2011 and had served on its board of directors since 2008. During his tenure, the company’s annual revenues grew from approximately $80 million to $123 million and he led the company through its 2015 acquisition of the US IT staffing business of Hudson Global Resources Management.

“I want to thank the board, Mastech employees and customers for their support and am proud of the great things we have accomplished despite the often challenging environment for the staffing industry,” Horner said.

Gupta, 52, joins Mastech from RPG Enterprises where he served as the chief executive of the Americas, RPG Group, since October 2015. From 2011 to October 2015, Gupta was chief executive of Global Infrastructure Management Services at Zensar, a global information technology services company and part of the RPG Group. He joined Zensar in 1984 and held a number of senior executive positions in the US, Europe and India.

Mastech ranks on Staffing Industry Analysts’ list of largest US staffing firms.