I recently returned home from Anchorage, and I can't recommend Carl and Alaska Photo Treks highly enough. I was very pleased with the entire experience. Their page is informational, the booking process is simple and responsive, and the tours were great. The whole operation was very professional, and to say Carl is knowledgeable is a significant understatement. He is very patient and helpful with the setups and camera equipment, as well as being generous with his local knowledge and his knowledge of the Aurora Borealis and the art/science of chasing the lights.
While we were lucky enough to get some great displays of the Aurora on multiple nights in a row, I would've been satisfied with my experience even if the lights had not chosen to grace us with their presence. The locations selected were perfectly suited to the conditions of each night, and made for wonderful scenery, with or without the Aurora. Anchorage is truly a great setting for chasing the lights if your goal (like mine was) is to capture beautiful landscapes and hope the lights come out. Highly recommend, and would gladly join again next time I am back in Alaska!