Polley, in a statement, said he expected Hammer to have “a tremendous impact on the continued progress we are making growing Spectrum’s platform.”

After Hammer leaves, ADESA will be co-led by Mike Caggiano, current executive vice president of ADESA’s U.S. operations, and Jay Bahel, who is now ADESA’s senior vice president of business transformation. It was not immediately clear whether Caggiano’s and Bahel’s appointments were on a permanent or interim basis.

“John’s dedication to his team and customers has been instrumental in building ADESA into an industry leader,” Carvana CEO Ernie Garcia said in a statement to Automotive News. “He has made a significant contribution to Carvana and I thank him for his friendship and advice during the integration of our two companies.”