The Biology Teaching Assistant Project (BioTAP) provides a year-long mentoring program for practitioners and researchers of Biology Graduate Teaching Assistant Teaching Professional Development (GTA TPD). The program participants, known as BioTAP Scholars, are guided through the process of implementing a research project on GTA TPD. The rationale for the program is that GTAs are critical to the instruction of STEM majors and therefore need TPD to build instructional skills known to support stude…