An e-mailed announcement from the chamber said only that Tingen quit "to pursue other career interests" and that Tammy Shepherd, the vice president of business development for the chamber, will serve as interim president.
"It is true," Tingen said. "I have resigned from the chamber. I don't think I've misbehaved or anything like that. It's just one of those things -- I'm pursuing other interests, other business interests."
When asked if he had any specific business pursuits in mind, Tingen laughed and said, "Right now I'm going to be working on the weeds in my front yard."
Tingen was hired April 15.
Acknowledging that the resignation would seem sudden to outsiders, Chamber Board Chairwoman Yvonne Meeks would not say whether the resignation was preceded by a disagreement with the board.
"We want it to be a very positive spin for everybody," she said. "Our group is a very astute group. We don't make any quick moves."
Tingen wouldn't discuss whether there had been a disagreement with the board, such as the pay dispute that led to the resignation a year ago of then-President Karen Chrjapin.
"It's not like I tried to get raises, and they wouldn't approve it," Tingen said. "I really can't tell you anything now except that I agreed to pursue other interests, and they agreed to move on."
Tingen formerly was with CallingPost Communications. After Chrjapin's resignation, he was selected for the position from among three finalists, including Shepherd.
All chamber events planned for Masters Week will go on as scheduled, with Shepherd taking Tingen's place, Meeks said.