 Williams also authored and co-authored cases illustrating financial policies of banks and corporations, including Chase Manhattan Bank, First Pennsylvania Corporation and General Motors.Williams' notable former students include John S. R. Shad, chairman of the U.S. Securities and Exchange Commission; Thomas C. Theobald, chairman and chief executive officer of Continental Bank Corporation; Clemmie Spangler, President of the University of North Carolina; and John H. McArthur, Dean "Emeritus" of Harvard Business School.Williams was also involved in Harvard Business School's Executive Education programs and was a member of the initial faculty group for the School's International Senior Management Program (now part of the Advanced Management Program) in Switzerland.