A paleontologist and a featured expert on several science-themed television specials, he is perhaps best known for hosting Mammoths Unearthed on the National Geographic Channel. He also appeared in the 2013 documentary Titans of the Ice Age and in the 2010-2011 series Life After People.
He began his paleontological career at Los Angeles' Natural History Museum and first appeared on television in a 2009 episode of Dirty Jobs.
He was featured in a 2011 television movie titled History of the World in 2 Hours.
A native of Los Angeles, California, he once worked at the city's famous La Brea Tar Pits site.
Valle was featured along with narrator Bryan Cranston in a 2013 miniseries titled Big History.