Secret Service Director Mark Sullivan will retire effective Feb. 22, an agency spokesman confirmed Friday.

Sullivan, who has led the agency since 2006, began his career with the Secret Service in 1983. He will be the third-longest serving head of the agency, and was responsible during his career for overseeing 23 national security special events, including the 2009 presidential inauguration.

President Obama praised Sullivan in a statement and thanked him for protecting five first families, “including my own.”

“Mark has led the agency with incredible dedication and integrity,” Obama said.

Sullivan’s tenure at the Secret Service might be most remembered for the Colombian prostitution scandal that enveloped the agency last year.