 ROSEMONT, Ill.--BUSINESS WIRE--Wynnchurch Capital, L.P. Wynnchurch, a leading middle-market private equity firm, announced today that Russell Gehrett has joined the firm as a Partner and will be opening an office in New York. Prior to joining Wynnchurch, Russell was a Partner at Pamplona Capital. He joined the firm in 2012 to help grow the North American investment efforts in the business services, industrials, and consumer sectors. Mr. Gehrett has served on the Board of Directors of more 