This project aims to serve the national interest by engaging facilitators of biology course-based undergraduate research experiences (CUREs) in the creation and evaluation of novel professional development resources and opportunities designed for laboratory coordinators and teaching assistants (TAs) who are, themselves, responsible for leading CUREs. The research-oriented nature of a CURE presents a unique set of instructional challenges for those that teach them, requiring distinct professional development (PD) opportunities. Given that no community currently exists that focuses on CURE TA PD and the literature on CURE TA PD is limited, this project aims to establish the CURE Teaching Assistant Professional Development to Enhance Scientific Teaching, Research, and Mentoring Capacity (TAPESTRy) network, with the primary goal of advancing CURE TA PD knowledge and best practices. Specifically, this project will: (1) establish the CURE TAPESTRy network and cultivate growth in the network through recruitment of diverse individuals interested in professional development for laboratory coordinators and TAs PD; (2) characterize the current landscape of PD opportunities for CURE TAs through a literature review and national survey; (3) create, implement, and evaluate an innovative year-long fellowship program for CURE TA PD facilitators, in which fellows will create and assess CURE TA PD resources; (4) generate a curated repository of field-tested CURE TA PD resources, which will