A search is on for a new president at SCCA Pro Racing after Derrick Walker announced his resignation from the Sports Car Club of America’s for-profit subsidiary on Wednesday.

Walker will remain at the helm while a replacement is found. His resignation comes less than one week after Lisa Noble resigned as president and CEO of the SCCA.

Walker came on board to pilot the F4 United States Championship powered by Honda through its launch and opening season, in addition to overseeing the sanctioning of Pirelli World Challenge, Trans-Am Series, the Battery Tender Global Mazda MX-5 Cup presented by BFGoodrich Tires, as well as the Atlantic, F2000 and F1600 Championship Series.

“I have enjoyed my time with the SCCA Pro Racing, and in particular the launch of the F4 Championship here in the United States,” Walker said. “After two successful race event weekends, it’s clear that the series has a great deal of potential. As for my future, I fully intend to continue on in racing.”