with Kraft, all in Chicago, Illinois. Lester Ary convinced Jack to study law and join him in Cherokee.Jack graduated from DePaul University School of Law and practiced with Lester Ary until his death in 1962. Jack practiced on his own until joined by sons John Jr. in 1974, Richard in 1983, and Will in 1987. Jack passed away in 1996. Jason Cook, the son of John H. Cook, Jr., and the grandson of Jack Cook, joined the firm in 2014.