It so happens they're there this week for the company's annual meeting. Timely article.
They may not have exactly the same employment policy today, but working at the National Park concessions is still an interesting opportunity for young people (from around the world). Fresh out of college, my sister worked at Yellow Stone. There were other young people from all over. As a naturalist and photographer, she really enjoyed living 200 yards from Old Faithful for a summer.
[1] http://www.grandcanyonlodges.com/lodging/bright-angel/ [2] http://www.grandcanyonlodges.com/lodging/el-tovar/