After retirement from pharmaceutical research, Paul Wittreich pursued his outdoor hobbies, hiking the AT and bicycling trans-America. In addition, post a solo bicycle ride crossing Canada, he tandem bicycled the length of the Mississippi River with his wife, Terri, and coast to coast of the USA with his daughter, Caitlin, going a southern route. Outside ventures emanate from his Western Pennsylvania home.
Besides, hiking and biking, there are indoor ventures too: writing and illustrating a children's book plus extensive graphic designing and a great interest in art which now has evolved into photography. The latter quest has produced many showings to the public.