Never heard of the man.
Never underestimate the resourcefulness, ingenuity and adaptability of free men.
I usually don't. But it is true that there is a finite amount of space and resources that we all compete for, and throwing artificially long-lived, resource-intensive human beings into that mix will result in fewer resources for everyone (at least the creatures that are fortunate/intelligent/tough enough to be able to compete for said resources). And unless we get cracking on some way to send our best and brightest to other worlds (which doesn't appear we will be doing any time soon), I for one don't want to be around to watch 25 pounds of sausage get stuffed into a 5-pound wrapper.
Not everybody can live on the Big Rock Candy Mountain.