"He would disappear into the woods for weeks at a time, often with nothing but the clothes on his back, and emerge ruddy in health and even a few pounds heavier...."

"By way of income, Mr. Brown ran Tracker School, a series of weeklong courses in the intricacies of bare-bones wilderness living and what he referred to as 'the wisdom of the track.'... Students sleep in tents on the ground, eat around a campfire and use field latrines, in between classroom instruction and hours of what Mr. Brown called 'dirt time,' which they spend bent to the earth, looking for traces of woodland creatures.... Mr. Brown and his instructors welcomed hundreds of people a year, including middle-school students, bored computer programmers and seasoned outdoor professionals from around the world. Though he could seem aloof and intense, Mr. Brown built a broad following...."

From "Tom Brown Jr., World-Renowned Survivalist, Is Dead at 74. For decades, he ran a school in the New Jersey wilderness that taught thousands of students how to survive and even thrive in the great outdoors." (NYT).