Osman Tolga Aricak is a professor of Educational Psychology. He received his BA degree in Counseling and Guidance Program from Istanbul University in 1993, MA degree in Psychological Services in Education in 1995, and PhD in Educational Sciences from the Marmara University Istanbul in 1999. He worked at Trakya University, Indiana University Bloomington, Tulane University, Harvard University, and Hasan Kalyoncu University respectively. He is currently professor of education in the Department of Primary Education at Bogazici University. His current research focused on problematic use of Internet. He is also interested in statistical and methodological issues in psychology and education.