I just got back from the joy of taking the two full day tour of Yellowstone. I am still on a high. The guides provided a knowledgeable insight for a full day with people that love Yellowstone and it glorious inhabitants and wonders. The imparted their enthusiasm of the natural wonders, the wild life and the history. This is definitely NOT your pre-recorded, follow the map get on and off the bus day. It is full of adventure and taking advantage of what Yellowstone shows of itself, taking advantage of the unexpected views of wild life and the environment. Their knowledge and good nature make the time fly by. I know I am beginning to sound like a "shill" but I have written reviews and given my opinions for many years. A check of my past reviews will show that "I call em like I see them". All of the guides are very capable. My personal feeling is that I would insist on Jack and/or Jackson to the extent of even moving the tour dates to get them.
PS Jackson also has a major love for fly fishing (with photos to establish his "creds". However, Jack is not impressed with the hype and says he is the fisherman. (You may want to take two days and find out for your self)