This empirical census study was a quasi-experimental analysis of certification level (primary vs. secondary) and in-field vs. out-of-field certification. The sample included chemistry teachers (n = 2312) and physics teachers (n = 1387) in New York State in 2011-12. Findings indicated that the number of out-of-field teachers was relatively low, but…

This case study explored chemistry teacher isolation through the compilation and analysis of contextual characteristics and student performance data of 895 public schools and 2321 chemistry teachers in New York State in 2011-12. Data on the teachers' qualifications along with school characteristics were collected from several independent, publicly…