Hossein Hajiabolhassan is a faculty member in Applied Mathematics Group at Shahid Beheshti University. Also, he is a member of Data Science Center of Department of Mathematical Sciences of Shahid Beheshti University. He become interested in data science, not because he has any answers but because he has lots of questions. He teaches graduate and undergraduate courses in data science & combinatorics. Also, he supervises student thesis projects in data science.