A.k.a. The King of woo woo
The arch-bishop of woo himself, and probably one of the most influential (and flaky and zealous) crackpots chugging along today. A prolific author of New Age/self-help books (and a regular contributor to that absolutely abhorrent cesspool of anti-science, Huffington Post), Chopra is famous for using poorly understood (or not understood at all) vocabulary from physics, particularly quantum physics, mixed with “Eastern knowledge”. His writings are usually centered around woo-y claims along the lines of “recognize your inner beauty and the quantum entanglement will cure you”. Ardent opponent of “materialistic science” which hasn't yet recognized the ancient wisdom of Eastern spirituality, reincarnation, homeopathy and such. Earns a lot of money.
His most common inference rule is The Galileo Gambit (“scientist uniformly reject my ideas, but hey! Remember Galileo; his ideas were also reject by the scientific community [well, the church, in fact] back in the days; therefore I am right and everyone else are close-minded). An antidote is available here.
Some examples of his style: Chopra bashing skepticism (that is, Chopra fighting against logic and scientific inquiry – spot the fallacies): ; Chopra being taken on by Michael Shermer; Chopra on ”only spirituality can save the world” (and as Myers points out, Chopra neglects to tell us how); Chopra failing to deal with criticism; Chopra ”proving” that there is an afterlife; Chopra in general (this is part 3; links to the earlier ones); Chopra failing critical thinking yet again.
Well, I guess you get the point. This is a guy so utterly unable to grasp the foundations for critical thinking, so completely out of touch with reason, rationality and the ability to distinguish evidence from wishful thinking, that he must set some kind of record.
Diagnosis: This guy is seriously dangerous; he’s been claimed by Time magazine to be one of the 100 most important people of the 21st century; he has a huge following (Mikhail Gorbachev referred to Chopra as "one of the most lucid and inspired philosophers of our time"). His grasp of reason, critical thinking and reality is more tentative than Jack Chick’s, however, and the lunacy he represents might in the long run be even more dangerous than the Discovery Institute.
In short, he is probably the most influential loon in our Encyclopedia, and among the most dangerous (with Cynthia Dunbar and David Barton and some others).