Gary Palmer, president and CEO of Prairie Meadows Racetrack and Casino, will serve as the corporate chair of the 2012 Walk to Defeat ALS, announced the Iowa chapter of the ALS Association. Palmer succeeds Suku Radia, president and CEO of Bankers Trust Co., in that role. Last year, participants and companies involved in the Des Moines walk raised $325,000 to assist Iowans affected by amyotrophic lateral sclerosis, also known as Lou Gehrig's disease. Prairie Meadows will serve as the presenting partner for the 2012 event, which is scheduled for Oct. 6 at Principal Park. To register for the walk or donate online, visit www.WalktoDefeatALS.org.