From the time AJ picked us up until he let us off at the end of a wonderful day, we and what we wanted to see, when we wanted to stop, were his focus. He knows a lot about the Park and knows best routes to avoid traffic backups and shares his considered opinion about the value of this and that feature available to us -- but left decisions up to us. We chose the west-south loop for the day and saw lots of animals and a wide range of flora and geological, geothermal features through the day. He assisted us in our picture making and made many with us that he happily shared. The day was our intro to Yellowstone, and I recommend AJ and Globe-Trekkers for orienting us to the many features of the Park, so we will make the most of our remaining days self-guided. He even sketched an itinerary for our next day to Upper Mesa Falls, Frostop's Drive In in Ashton, ID, St Anthony's Sand Dunes, and Harriman State Park, with its famous John Muir Trail.
(Food from NPS concessions was disappointing, but that's not Globe-Trekker's issue. Consider bringing your own lunch for the day-long tour. We had plenty of snacks and drink to satisfy us.)
Would hire him again and send our friends to AJ. He gets what travelers new to the Park will likely benefit from the most and does his best to deliver full value.