The following year, he won the USOC National Coach of the Year in 2017. Bill and his younger brother, Mike Zadick, are part of the University of Iowa's tradition of brothers competing for the Hawkeyes. Mike was a 2008 Olympian and the 2006 silver medalist at 132.25 pounds (60 kg). He was a three-time all-American for the Hawkeyes, winning a Big Ten title at 149 pounds in 2002. Mike is currently an assistant coach for the Iowa State University Cyclones. Zadick is the son of Bob and Toni Zadick of Great Falls. He also has two sisters, Terri and MaryAnn. He lives in Colorado Springs, Colorado.