Finally, interview participants in all roles in TREC I stated that trainees were important leaders in developing new TD projects both within and across TREC I research centers. As trainees worked to identify their professional niches, they provided innovative leadership to move into new TD areas of science. To do this, they bridged projects and investigators across various disciplines, fields, departments, schools, and TREC I research centers. They also brought more senior collaborators along with them, to engage in highly innovative TD research.