George Ellis, writing in the journal "Nature", described Tipler's book on the Omega Point as "a masterpiece of pseudoscience… the product of a fertile and creative imagination unhampered by the normal constraints of scientific and philosophical discipline", and Michael Shermer devoted a chapter of "Why People Believe Weird Things" to enumerating what he thought to be flaws in Tipler's thesis. Physicist Sean M. Carroll thought Tipler's early work was constructive but that now he has become a "crackpot". In a review of Tipler's "The Physics of Christianity", Lawrence Krauss described the book as the most "extreme example of uncritical and unsubstantiated arguments put into print by an intelligent professional scientist".