I have known two people who have attended Tom Brown's school. Both reviewed it badly as more of a spiritual experience than actual tracking.
http://blog.professionaltrackers.com/
http://www.ttos.us/
No financial links with either school, but I have trained with the former, which is run by a tracker who got his start in the Portuguese Army during the Colonial Bush Wars of the 60's and 70's and then transitioned to SWAT/counter-drug work in Nevada and California. The latter school is owned by the Rhodesian Officer who ran their domestic tracking program (not sure that he was a trainer or even a tracker there, but he's been around the art for at least 45 years). TTOS only offers courses to mil/leo; however, Fernando will teach Search and Rescue volunteers (or if a large group of hunters contracts him, something for the civilian world). In either case, you will be training with men who tracked under combat conditions against hostile targets- something that does not seem to have ever been true of Tom Brown. The word among early students is that Tom was a good tracker for SAR and animals but something of a story-teller about the combat/LE side. That being said, I have enjoyed several of his books as being very informative for training yourself. If you require something on the East Coast, one of Tom Brown's early students who eventually took over most of the training left and set up his own school called
http://www.onpointtactical.com/.
Some of the other instructors there do claim mil experience, and he does seem more focused on the mechanics rather than the spiritual journey so his classes have attracted more mil/leo interest than TBTS.