Clarence H. Willis III, better known as Jack, a longtime horseman and assistant in racing on the East Coast, died Monday at the age of 81. Willis worked for the prominent Bostwick family in Aiken, SC before going on to work for the Phipps family under trainer Angel Penna, Sr. in the 1980s. He oversaw all of the powerhouse stable's yearlings and some layups in Aiken before moving north to help manage the Phippses' racing stable on the New York circuit of Belmont and Saratoga. Some of the more well-known...