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See HOP 2-2210: Faculty Leaves and Special Academic Assignments.

What is Faculty Leave of Absence (Unpaid Leave)?

A Leave of Absence is a period of leave during which the faculty member does not receive compensation from any source of funds administered by the University for either all or part of their regular appointment. The time off may be requested for either professional reasons when the faculty member will receive no UT-administered pay for all or part of their regular assignment, or for personal reasons where no paid leave balance is applicable or available.

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