Aramark /zigman2/quotes/204468030/composite ARMK -1.35% has appointed John Zillmer chief executive, effective immediately. He succeeds Steve Zadove, who will stay on as chairman. Zillmer was previously with Aramark for 18 years, serving at one point as president of global food and support services. He left the company to serve as CEO of Allied Waste Industries and was CEO of Univar, a chemical and ingredients distributor. Zillmer joins the board along with five others, including Yum Brands Inc. /zigman2/quotes/209029767/composite YUM +0.13% CEO Greg Creed and former McDonald's Corp. /zigman2/quotes/203508018/composite MCD -0.62% executive Karen King. Aramark stock has rallied 47.4% for the year to date while the S&P 500 index /zigman2/quotes/210599714/realtime SPX +0.45% has gained 17.8% for the period.