In this article, the authors argue for the use of ecological models of development in studies of teachers prepared through alternative certification (AC) programs. Previous studies of candidates in AC programs have focused on variables that describe their demographic characteristics. An ecological approach focuses on persons and situates their desires and attitudes toward teaching as shaped by their particular life circumstances and personal histories. This approach was applied to a large-scale study of individuals enrolled in California's teacher internship program. The results are the development of six typological profiles that capture some of the complexities behind why individuals choose to enter teaching through AC routes. (Contains 3 tables and 1 note.)