Duluth’s Chief Financial Officer Adele Hartwick, who took the city job in 2009 after retiring from Advanstar Communications Inc., is now leaving the city to return to the company.

She’ll be in charge of the day-to-day financial operations for the Duluth office of the world-wide company, which produces trade shows and events.

She’d come to the city job after 30 years with Advanstar, joining another Advanstar alum, David Montgomery, the city’s chief administrative officer.

Advanstar said they lured Hartwick back because it is “focused on hiring and retaining elite talent,”  said Advanstar CEO Joe Loggia. It also emphasizes the company’s commitment to Duluth, where it has 70 employees, he said.

Hartwick will leave the city job in June, and a search for a new city CFO will start immediately.