After this initial exposure, Warren went on to study the rich Japanese culture that spawned this unique art form. He found himself being able to relate closely with the aesthetic and beautiful Japanese traditions. In addition to his Asian studies, Warren majored in engineering and horticulture while attending college.

Warren’s involvement in Bonsai continued through the membership in various local, State and National organizations.

Warren’s formal Bonsai studies and training has been with a wide variety of Japanese Sensei (teachers) which include such notables as John Yoshio Naka and Saburo Kato.

In 1974, after the maturing of his knowledge and techniques, Warren began teaching.

Since 1974 Warren has conducted lectures, demonstrations and workshops for numerous State, National and International Bonsai organizations.

Warren has conducted numerous television and radio interviews and programs on the Art of Bonsai. Among the notables are The Voice of America Television, U.S.D.A. Radio, EGG Public Television, N.Y.C. and The Colombian, S.A. Public Broadcast Co.

Photographs of Warren’s Bonsai have appeared in such notable Japanese Publications as the Journal for the Nippon Bonsai Association and the Kenkyusha Publishing Company’s National Magazine, “Satsuki”.

Warren was selected to exhibit in the Masterworks of Bonsai Exhibition, Japanese-American Cultural Center, Los Angeles, 1981. National Endowment for The Arts Sponsorship.

In 1996 Warren was selected by the Federal Government , U.S.D.A., Agricultural Research Service, to be the Supervisory Curator for the United States Bonsai and Penjing Museum at the U.S. National Arboretum, Washington, D.C.

During his tenure at the Museum, Warren was named as an advisor to the National Bonsai Foundation, Washington, D.C. On September 30, 2001 Warren retired after serving as head of the Museum’s Staffing and Operations for five years.

Warren leading Bonsai / Penjing Museum tour for honored guests Kunihiko Saito, Ambassador of Japan, Deputy Secretary of Agriculture Richard Rominger, and National Bonsai Foundation President, Felix Laughlin and wife Betty-Gayle. (Mr. Rominger is on Mr. Saito’s right-rear, Mr. Laughlin is on Warren’s left-rear, Betty-Gayle in center.)

After leaving Federal Service, Warren and his wife Sharon relocated to Sharon’s home State of Tennessee.

Warren maintains a busy teaching and appearance schedule throughout the Nation.

In addition to his busy teaching schedule, Warren has authored numerous articles on Bonsai and Horticulture for State, National and International publications. Notables include American Bonsai Society Journal, Bonsai Clubs International Magazine and Pacific Horticulture Journal.