[7] This drew the ire of Parker Brothers, who threatened legal action and denied Walker admission to its sanctioned Monopoly tournaments.

This in turn led Walker to join forces with Ralph Anspach, the inventor of Anti-Monopoly, who was also engaged in a legal battle with Parker Brothers.

[8] In 1992 Walker and Michael Loeb[9] co-founded New Sub Services, today known as Synapse Group, a company that used the credit card network to process magazine subscriptions.

[14] He worked with IGT to develop innovative concepts and technologies for dozens of networked slot machines and other gaming devices, initially under a comprehensive license agreement.

Customers receive a fixed number of slot machine spins or blackjack hands, known as a "session" of play, at a discounted price, by paying in advance.

[16] Industry business journals reported that Perfect Pay utilizes RFID technology to track baccarat wagers, hand outcomes, payouts and player ratings in real time while eliminating losses from dealer mis-pays, counterfeit chips and other problems.

In 2018,[20] Jay Walker and Marc Koska co-founded ApiJect Systems, Corp., a medical technology company that creates single-use plastic injectors.

Faced with mounting financial losses, Jay Walker laid off 106 of his 125 employees, violating Federal employment law requiring 60 days notice when laying off more than 33% of the workforce.

[24] In November 2010 Walker Digital LLC sued Facebook for friending, or "Method and system for establishing and maintaining user-controlled anonymous communications".

[25] On April 11, 2011, Walker Digital filed 15 lawsuits against more than 100 defendants including Amazon.com, Google and Microsoft for unauthorized use of its intellectual properties.

He is a frequent speaker and contributor to its conferences, having delivered talks on such topics as human imagination[31] and "English language mania",[32] among others.

[33] Walker has partnered with the World Economic Forum in Davos, Switzerland, to develop enhanced communications systems between business and governments.

[35] Walker funded the development of two public policy documentary films about the space race and the role of science in American life.