Walt Brown has worked for 20+ years exploring a YE interpretation of scientific data, and over the years, has offered some fascinating theories. What I like most about his work is that it is very comprehensive. He has an eye for being able to see the big picture.
He has added a section to his website on the Grand Canyon. He has made many trips to the Grand Canyon over the years to conduct field work, and recently led a group in exploring his conclusions. Interesting read.
He also provides his take on global warming.