After the Museum of Vertebrate Zoölogy paved the way, wildlife studies in the park increased, and Yosemite found better representation in the biological literature. Most of the workers who had participated in Grinnell’s survey published extensively. Others who made notable contributions are Charles W. and Enid Michael, Barton W. Evermann, A. B. Howell, Vernon Bailey, J. M. Miller, John A. Comstock, E. O. Essig, and Edwin C. Van Dyke. After 1920, when the National Park Service instituted a park-naturalist program in Yosemite, the regular and seasonal employees of the Naturalist Department made many contributions to the scientific knowledge of the park. Among the permanent park naturalists who conducted biological investigations are Ansel F. Hall, Carl P. Russell, George M. Wright, C. A. Harwell, C. C. Presnall, A. E. Borell, M. E. Beatty, James Cole, C. Frank Brockman, M. V. Walker, Harry Parker, and Russell Grater. D. D. McLean, who participated in the Grinnell Survey, also made further contributions as a regular employee of the Naturalist Department. Dr. H. C. Bryant, first as a seasonal employee and later as a regular member of the Director’s staff, published extensively on his studies in the park and was influential in starting many other workers on investigations of biological nature. One important development in biological research in Yosemite had an influence on the wildlife program of the entire National Park Service. George M. Wright, ranger and Assistant Park Naturalist, during the late 1920’s sensed the dangers of the uncoördinated wildlife policy of the National Park Service and determined that there should be better administrative understanding of the normal biotic complex of Yosemite and all other national parks. In 1929, Wright was placed on a field status in order that he might organize a central unit of wildlife investigators to survey the wildlife problems of the National Park Service and recommend a broad Service-wide policy of wildlife management. Joseph S. Dixon and Ben W. Thompson were employed by Wright to assist him in this undertaking. Their work during the next several years was conducted from headquarters in Berkeley, California, and from Washington, D. C. It demonstrated that a Wildlife Division was an important administrative adjunct in the Director’s organization. In 1936, Wright lost his life while in the course of his significant work. Such progress had been made in establishing policy and procedure that the program persisted. It holds a strategic place in the regular administrative set-up of the Director’s office and reaches all field areas with its guidance.