Timothy (Tim) Leslie, Associate Professor in the Department of Geography and Geoinformation Sciences at George Mason University, has been a faculty member since 2007. Prior to joining Mason, he spearheaded the Arizona Indicators Project at Arizona State University, contributing to significant advancements in geographic research.

Dr. Leslie’s leadership at George Mason University is characterized by strategic initiatives and impactful reforms. During his three terms in the Faculty Senate, he was instrumental in establishing the University’s Undergraduate Council, creating the Mason Korea Faculty Handbook, and implementing minimum faculty salaries with increased promotion raises. He developed the online Dissertation Committee and Approval portal, leading comprehensive University Catalog revisions. Serving multiple terms as Chair of the College of Science Faculty, Dr. Leslie has championed academic excellence and governance. His leadership of the Academic Integrity Task Force resulted in transforming the Honor Code into Academic Standards with a restorative justice framework, underscoring his commitment to ethical academic practices.

Dr. Leslie has led transformative curriculum development initiatives, re-envisioning departmental bachelor’s degrees and PhD programs to improve graduation rates and reduce administrative burdens. He was instrumental in creating the Departmental Honors program for undergraduates and co-developing the College’s Science Leadership and Practice program. His work in establishing metrics for doctoral, master’s, and bachelor’s programs and overseeing course assessments has elevated academic standards. As Undergraduate Advisor and Academic Associate Chair, he oversaw significant enrollment growth while maintaining high standards for time-to-graduation and learning outcomes. Dr. Leslie’s contributions also include serving on the Mason Mpact Leadership Council, the Students and Scholars Faculty and Curricular Affairs Committee, and the New Ventures Advisory Council.

Beyond structural improvements, Dr. Leslie is committed to mentoring faculty, staff, and leaders, particularly those new to the institution. His relational and holistic approach provides crucial support and guidance, ensuring community members thrive at Mason. He has also contributed as a Summer Team Impact Mentor, with the Aspiring Scientists Summer Internship Program, and through the University Undergraduate Apprenticeship program.