Ken Wilber may be the most important living philosopher you’ve never heard of. He’s written dozens of books but you’d be hard-pressed to find his name in a mainstream magazine.

Ken Wilber chart. Ken Wilber has built a large and enthusiastic following over the last 20 years with a series of books building his “integral theory of spirituality”.

I met Ken Wilber in the 1980's, decades before he launched Integral Institute, which would soon catch fire around the world. Standing next to him in a wooden A-frame house in Mendocino, California ...