Jadi, one of Kian’s former students in Tehran,  has written this post about his detention. Jadi says:

Kian Tajbakhsh was my Urban Sociology professor. He returned back from USA around 2 years ago and started teaching us “Urban Sociology” at the university of Allame. He has studied in Columbia University and worked at New School. I remember that during the class somebody asked him about the reasons for coming back to Iran. He said: “I returned back to show others that we can work here. We can promote the situation.”

I think he succeed. I learnt that we have to continue. I don’t know why the authorities have detained him.