RecruitingBehavioural interventionAcceptance and Commitment Therapy Integrated Vestibular Rehabilitation (ACTIVE) RCTThe primary objective of this multi-site randomized clinical trial (RCT) is to compare Acceptance and Commitment Therapy Integrated Vestibular Rehabilitation (ACTIVE) with usual care vestibular rehabilitation (VESTIB CONTROL) in 250 individuals with mTBI-related vestibular symptoms attributable to mild traumatic brain injury (mTBI) treated at one of two sites (1) the University of Pittsburgh Medical Center, or (2) the Intrepid Spirit Center, Carl R. Darnall Army Medical Center, Fort Hood, Texas. Both interventions will be delivered weekly over 4 weeks. Assessments will be administered prior to the start of treatment (Baseline) and at 4-weeks, 3- and 6-months following the completion of treatment.