About Thanasis Stengos Thanasis Stengos is a faculty member in the Economics Department at the University of Guelph, Ontario. Books by Thanasis Stengos Student Solutions Manual for Mathematics for Economics, fourth edition by (author) Michael Hoy, John Livernois, Chris Mckenna, Ray Rees & Thanasis Stengos Mathematics for Economics, fourth edition by (author) Michael Hoy, John Livernois, Chris Mckenna, Ray Rees & Thanasis Stengos Mathematics for Economics, third edition by (author) Michael Hoy, John Livernois, Chris Mckenna, Ray Rees & Thanasis Stengos