John Vlissides

John Matthew Vlissides (August 2, 1961 – November 24, 2005) was a software engineer known mainly as one of the four authors (referred to as the Gang of Four) of the book ''Design Patterns: Elements of Reusable Object-Oriented Software''. Vlissides referred to himself as "#4 of the Gang of Four and wouldn't have it any other way". Provided by Wikipedia