William joined the federal government in 1995 after graduating from college. In 2004, William was selected to be the Assistant Commander for Contracts at Marine Corps Systems Command. In 2009, at age 39, William was selected into the Senior Executive Service (SES) as the Director of the Procurement Oversight, Department of Homeland Security, Headquarters. In July 2010, William was selected to be the Director, Office of Acquisition Management for U.S. Immigration and Customs Enforcement (ICE). In 2013, William accepted an assignment as the Assistant Director for Operations Support within ICE. In August 2016, William retired from the federal government with over 26 years of public service.
After retirement, he joined an acquisition consulting firm as a Senior Consultant and in 2019, William founded THINK Acquisition to focus on increasing the individual and team effectiveness of all participants in government contracting in the areas of acquisition, contracting, program management and leadership.