Tull is the inaugural Vice Chancellor of Diversity, Equity, and Inclusion at University of California, Davis and a founding Director of the National Science Foundation funded program PROMISE: Alliances for Graduate Education and Professoriate, which aims to increase the number of underrepresented students in STEM.

[10] She was the only American and the only female finalist of the 2015 GEDC Airbus Diversity Award and was selected to speak in Australia about the advancements and progress she had made as Director of the PROMISE program.

[4] In addition to PROMISE, Tull also Directed and was the Co-Principal Investigator of the NSF funded Louis Stokes Alliance for Minority Participation in the University System of Maryland.

[12] Tull also coined the term the “Jessica Effect” which describes the need for involvement of friends and family in the careers, milestones, events of students in her STEM recruitment programs.

[12] Tull's work on the Jessica Effect was published in the Association of American Colleges and Universities [13] and was discussed at The Atlantic event “A New America: Empowering Hispanic Millennials for Tech Leadership” in 2014.

[14] Tull continued to work with students in Puerto Rico and co-led the ADVANCE Hispanic Women in STEM was vice president of initiatives for the Latin and Caribbean Consortium for Engineering Institutions.

[16] Tull is now also the co-chair of the task force at UC Davis that is restructuring the way campus safety is practiced going beyond policing and towards incorporating social work and mental health resources and support.