Sonia Mileva, PhD, DSc, is a Professor, full-time Lecturer and Researcher in the Faculty of Economics and Business Administration at Sofia University “St. Kliment Ohridski”, Bulgaria. Her research interests are in the fields of tourism marketing, strategic development and specialized (niche) tourism.Nikolina Popova is Director of the Tourism Department at the International Business School – Botevgrad, Bulgaria, having previously served as full-time Lecturer, Head of the Tourism Department and Deputy Dean of the Faculty of Geology and Geography at Sofia University “St. Kliment Ohridski”. Her work focuses on curriculum design and development, and sustainable development in the field of tourism. In 2009, she received an award from the Sofia Tourist Region for her contribution to the development of tourism education. She chaired the Council for Tourism Training in Bulgaria from 2006 to 2016 and was a member of the National Tourism Board in Bulgaria (2005-2013). She has conducted over 20 international and national research projects.