It was his work with the World Bank that led him to invent a "Table Maker" software program that would allow formulae to be abstracted from data, therefore allowing the table's formulae to be re-used with different data sets without the need for a new program.
[citation needed] Coincident with the advent of early personal computer platforms such as Vector Graphic and Northstar, which utilized the CP/M operating system, Roizen was able to develop his "Table Maker" software for individual use on personal computers.
[citation needed] Roizen renamed it T/Maker[1] and sold the first version through software distributor Lifeboat Associates of New York.
In 1983 he co-founded T/Maker Company (with his sister Heidi Roizen) to take over sales and distribution of T/Maker and other software products.
[2] He has been included in Accidental Empires: How the Boys of Silicon Valley Make Their Millions..., History of the Personal Computer, Wicked Problems, Righteous Solutions: A Catalogue Of Modern Software Engineering Paradigms, and multiple issues of InfoWorld in the 1980s, 1990s and 2000.