Sezen is a professor of developmental psychology who worked full time in Ege University for 25 years, in Cyprus International University for a year and in Izmir University for six years, as department chair, lecturer, researcher and advisor for theses/dissertations of graduate students. After founding the Turkish Society for the Prevention of Child Abuse and Neglect in 1988 with Prof. Esin Konanç and a group of multidisciplinary professionals in Ankara, she contributed in the organization of several national and international conferences including the 2001 ISPCAN Conference in Istanbul, published research in topics such as child labour, children in institutions, court cases of child abuse and neglect, opinions and experiences of practitioners about child abuse in Turkey. She also participated in developing a service center for children on the street and the first unit for serving abused children and their parents in Ankara. She served in the ISPCAN Council for six years and co-chaired the scientific committee of the 2007 ISPCAN Conference in Lisbon. She was in the team that translated SAAF into Turkish and participated in the trainings of SAAF in several cities in Turkey.