Mountain guiding became Art's profession in 1995. In addition to working for MOP, he owns and operates Mooney Mountain Guides, based in central New Hampshire. As an AMGA/IFMGA certified Mountain Guide, Art has worked and climbed extensively in the North East, North America, South America and Europe. He is an AMGA technical committee member, AMGA rock discipline coordinator, and AMGA instructor and examiner. He also instructs guide training courses for the AMGA in rock and alpine disciplines each spring and fall. He instructs MOP alpine and backcountry skiing courses.