Tennille has worked as a Speech Pathologist for approximately 10 years. She has completed a Masters of Health Science (Research), University of Sydney. Her research focused on friendships following traumatic brain injury.
She has worked in a number of brain injury units across NSW, including as a Senior team member at the Mid Western Brain Injury Unit and Westmead Brain Injury Unit. She has also worked in the private health sector, as an original team member, at the Royal Rehab Private hospital. More recently Tennille has worked for Sydney Catholic Schools, consulting for over 20 schools. She was also the founding Director at NextPath, a service which provided ongoing learning opportunities for young adults with intellectual disability.