Robert Half International Inc.’s (NYSE: RHI) Chairman and CEO Harold “Max” Messmer Jr. will retire as CEO effective 15 December. M. Keith Waddell, who now serves as vice chairman, president and CFO, will take over the role as new CEO.

Messmer had served as chairman and CEO for 33 years, and he will continue with the US-based staffing giant as executive chairman.

In a statement, Messmer said the company will still have management continuity, adding its top executives and field operations leaders average more than 20 years with the firm.

“When I assume my new role as executive chairman next month, I look forward to supporting this outstanding team in the future as it continues to grow the Robert Half business,” Messmer said.

The new CEO, Waddell, has served as the company’s CFO for more than 30 years.

In addition, Robert Half announced that Paul Gentzkow will take on the role of president and CEO – staffing services. Gentzkow has been with the company for 30 years and formerly served as president and COO – staffing services.

Also, Michael Buckley was promoted to executive VP and CFO. Buckley has been with the company for 22 years and previously served as executive VP and treasurer.

Robert Half noted that Joseph Tarantino will continue as president and CEO of the company’s Protiviti division. Tarantino has been with the company for 17 years.