9 Months Ago, KTAK says (in Guide fined for snowboarding on park lake)  WY
AP) – The rules were broken at Grand Teton National Park, by a park worker. A Jackson Hole snowboarder and mountain guide was fined $1000 for riding a snowmobile across the park’s Jackson Lake. Stephen Koch pleaded guilty to the offense, ...
Flows to peak June 8 Jackson Hole Daily

And trib.com says (in Man fined $1000 for snowmobiling on Jackson Lake)  WY
By AP JACKSON -- A judge has fined a Jackson Hole snowboarder and mountain guide $1000 for riding a snowmobile across Jackson Lake in Grand Teton National Park. Stephen Koch pleaded guilty to the offense, which he videotaped and posted online. ...

And Jackson Hole Guide says (in Koch fined $1000 for snowmobile escapade)  WY
By Cory Hatch, Jackson Hole, Wyo. Jackson Hole snowboarder and mountain guide Stephen Koch was fined $1000 Thursday after pleading guilty to riding a snowmobile across Jackson Lake in Grand Teton National Park. Assistant US Attorney Lee Pico asked ...

12 Months Ago, Jackson Hole Guide says (in Exum fires guide Koch)  WY
STILL FROM YOUTUBE VIDEO By Angus M. Thuermer Jr., Jackson Hole, Wyo Exum Mountain Guides fired guide Stephen Koch this week after the mountain snowboarder violated Grand Teton National Park rules by using a snowmobile to access a Mount Moran climb and ...

And KIVI says (in Grand Teton investigates snowmobiling in video)  ID
AP) - Officials in Grand Teton National Park say they're investigating a YouTube video that shows skiers riding a snowmobile over Jackson Lake. Only ice fishermen are permitted to ride snowmobiles over the frozen lake. The video shows four skiers ...