My wife and i were excited at the opportunity of seeing wolves in their natural environment. We booked a full day guided trek and let Alpen Guides know we hoped to get off the typical drive and pull off the road type tour. Our hope was to enjoy a great hike and see some treasures of the park. Scott met us at 7am and was very personable. He shared interesting history and facts of the park throughout the day and worked hard to try and get us within view of different wildlife. We did see Elk, Deer, Bison, a Coyote and Proghorn sheep. Everything but a wolf! In all fairness we couldn't blame Scott at all since we learned later that no one had sighted a wolf in the park for 4 days. (And there are people who spend every daylight hour searching for days on end).
I would not hesitate to recommend Alpen Guides. They were reasonably priced compared with other guides and communicated well in the reservation process.