State Department of Revenue Services commissioner Kevin Sullivan announced this week he is leaving the agency to take a position in the private sector.
Sullivan, who was appointed to lead DRS by Gov. Dannel Malloy in 2011, will step down May 10 and join Versus Analytics.
The Scottsdale, Arizona-based company works with states on unpaid tax collections.
CBIA president and CEO Joe Brennan thanked Sullivan for working with the business community to address challenges associated with implementing state tax policy.
"Commissioner Sullivan understood that the world is changing rapidly and what that means for the needs of Connecticut's new economy," Brennan said.
"Our member companies appreciated his willingness to work with them and help them navigate and comply with state tax policies.
"We wish him nothing but the best in his new career."
Sullivan previously served as lieutenant governor and president pro tempore of the state Senate.
Joe Mooney, Sullivan's deputy at DRS, will serve as the agency's acting commissioner.
Mooney will be the keynote speaker at CBIA's June 7 Connecticut Tax Conference in Farmington.