Metin Kozak is Professor in the School of Communication, Kadir Has University, Turkey. He holds both Master's and Ph.D. degrees in tourism. His research focuses on consumer behaviour, tourism marketing, public health, and sustainability. Nazmi Kozak is Professor in the School of Tourism, Anadolu University, Turkey. He gained both his Master’s and Ph.D. degrees in tourism. His research activities focus on tourism marketing, history of tourism, and bibliometrics.