On 4 November 2021 UACS students had an opportunity to follow the guest lecture by Dr. Tim Gaul from the USA. His lecture comes upon invitation by UACS lecturer Dr. Darko Kostovski who teaches the course in Biological Basis of Behavior. Timothy Payne Gaul holds degrees in Osteopathic Medicine and he has been practicing Family Medicine in Western Pennsylvania. He is a member of the American Academy of Family Practice, Christian Medical and Dental Society, and American Society of Addiction Medicine. His professional interests include addiction, chronic pain, and co-occurring disorders in primary care.