Jack M. Guttentag

Jack Mack Guttentag (December 9, 1923 – February 6, 2024) was an American banker and academic who was a professor of finance at the Wharton School of the University of Pennsylvania. He was also a consumer advocate and creator of ''The Mortgage Professor'', a website that provides free and disinterested advice to consumers on mortgage-related issues. Provided by Wikipedia