Certification of physics teachers involves more than appropriate regulations. Members of college and university physics departments must participate in training good students for teaching positions in the schools. The development of appropriate state regulations and their intelligent interpretation into programs of study effective in producing physics teachers, who are to a degree scientists, involves effort on the part of physicists.This paper reports on work in physics teacher certification initiated and to a large extent carried out by K. Lark-Horovitz, Head of the Department of Physics at Purdue and first Chairman of the AAPT Committee on the Teaching of High School Physics.