Many programs promote professional development for teachers in laboratory settings. In fact, some research has shown these experiences can improve student achievement. However, it is unclear what aspect of the laboratory experience helps bring about this effect. In order to ensure all teachers participating in Stanford's Research Experiences for Teachers program received maximum benefit from the laboratory experience, supplementary seminars were delivered that emphasized a variety of skills and tasks required of career scientists and engineers. Teacher feedback indicates that participants found these seminars valuable and that they would prefer additional time for peer interaction and curriculum development.