Anton R. “Tony” Valukas will be leaving as firm chairman at Jenner & Block after 10 years in the top position at the firm.Valukas, 73, well-known in the Chicago legal community and beyond, will be staying on as a senior partner with the firm. The firm currently does not have plans to name a new chairman, which Valukas described as an “honorary” position he was appointed to in 2007.“This has been some time in coming, and I’ve talked to the partners, the policy committee and management …