Newly formed Ergon Mexico will supply Mexico with specialty naphthenic and paraffinic products produced at Ergon-owned refineries in Vicksburg, Miss., and Newell, W. Va. Ashlandelected William A. Wulfsohn as chairman and CEO effective Jan. 1, succeeding James J. O’Brien, who plans to retire at the end of December after 12 years as chairman and CEO.