Williams is a professor of law at Georgia State University College of Law in Atlanta, Ga., where he teaches and conducts research in a number of areas, including admiralty, bankruptcy, business and commercial law, tax, sports law, and Islamic law (Sharia). Presently, his business and bankruptcy law research has focused on the admissibility of financial expert testimony in bankruptcy courts, the emerging duties of directors and officers of insolvent corporations, and financial fraud and corporate accounting issues.

In February 2008, Williams began serving a second term as the American Bankruptcy Institute Robert M. Zinman Scholar in Residence in Alexandria, Va. He assisted ABI with its educational program and in its role as the authoritative source for bankruptcy information for the Congress, media, and public. For the years 2001–2003, he was selected by the editors of the Turnarounds and Workouts Journal as one of the Top Ten Outstanding Bankruptcy Academics in the country and as one of the Top Ten Bankruptcy Tax and Accounting Professionals in the country. For the academic year 1999–2000, he was a visiting professor at St. John's University School of Law in New York, where he taught in the inaugural year of the Bankruptcy LL.M. program. For the summer 2004, he was a visiting professor at New York Law School, where he taught in the Tax LL.M. program. For the 2004–2005 academic year, he was the Association of Insolvency and Restructuring Advisor Scholar in Residence, where he conducted research on credit management and the use of various techniques to uncover financial fraud. Additionally, he is a consultant with BDO Seidman, LLP, New York, in the areas of bankruptcy and financial advisory services, insolvency taxation, corporate security, and fraud and fraudulent transfer investigations.

Williams has served as an instructor for the IRS/NYU Continuing Professional Education Program, where he has taught bankruptcy and insolvency taxation through the IRS Satellite Distance Learning Program. He has testified before the House and Senate committees on pending bankruptcy and tax legislation. In 2004, he was inducted as a fellow in the American College of Bankruptcy.