Well he's listed as one of the speakers, but as he calls himself a "theoretical psychologist" perhaps he can attend without actually existing.
What an absolute quackfest.
Well, I'll be darned. Google tells me he's not dead. Last I heard he had a chronic illness and wasn't doing very well at all. I haven't read anything about him in years, though.
But after checking, turns out he has
RNase Enzyme Deficiency Disease. He says the disease "is thought to be either fully or partially responsible for a host of illnesses, including multiple sclerosis, myalgic encephalomyelitis, ALS, inflammatory rheumatoid arthritis, Gulf War Syndrome, fibromyalgia, to name a few."
So it turns out he is a sufferer and does belong at the conference by virtue of his experience with an energy-deficiency illness.
At any rate, don't knock it 'til you've tried it. I like Ken Wilber, although I don't necessarily agree with everything he says. He has some very interesting philosophical ideas, though.