Gravity Glue

Born June 30, 1984 artist and photographer Michael Grab first ventured into stone balancing in the summer of 2008 while exploring the beautiful landscape of Boulder Creek, Colorado. Ever since, he has become quite prolific in the art form and source of meditative practice and creative passion.
As Grab explains on his website Gravity Glue:
Balance requires a minimum of three contact points. Luckily, every rock is covered in a variety of tiny to large indentations that can act as a natural tripod for the rock to stand upright, or in most orientations you can think of with other rocks. By paying close attention to the vibrations of the rocks, you will start to feel even the smallest «clicks» as the notches of the rocks are moving over one another.
He recently returned from the Swiss alps where he was flown in to perform live at a private party in Davos during the World Economic Forum 2015. He stated it is the biggest gig of his career thus far. He is available for workshops and live appearances and can be contacted through his website.
Wikipedia explains rock balancing as being an art, discipline, or hobby (depending upon the intent of the practitioner) in which rocks are balanced on top of one another in various positions. There are no tricks involved to aid in the balancing, such as adhesives, wires, supports, or rings.
Styles of balancing:
Pure balance — each rock in near-​point balance
Counterbalance — lower rocks depend on the weight of upper rocks to maintain balance
Balanced stacking — rocks lain flat upon each other to great height
***update, Discovery Canada did a feature on Michael Grab lastnight and you can see it here (his segment is last and starts at the 12 minute mark).