There sure is.....it's called air drying. Set the stuff aside for as year or so and it should cure up just fine. Even with roots.I'd seal the cut ends to prevent overly rapid drying. Make sure they are placed where there is plenty of good air circulation and separate the pieces with some thin dry hardwood splints (called stickers).
Branches, the size for walking sticks usually will dry in about 6 months, if the bark is removed prior to drying. Bark on....a little longer.
There are plans available on line for solar kilns if he wants to invest a little money in the process. these will speed up the process considerably. I've never used these so don't have any direct knowledge of how well they work, but a google search of solar kilns should turn up the info for you.
http://www.motherearthnews.com/DIY/1...mber-Kiln.aspx
Here's one link
Al