Not easy to identity this great man in zero G. Who is he?

Cracked by: Ananth, Manoj, KK, Jayaprakash B R, Sumanth Patlolla, Bipin Banavalikar, bhargava, Manish Achuth, vinayaknp, rickde, Vishnu Prashanth, Logik, Supritha Maiya, raklodramA, Dibyo, Rogi, Mayukh Bose, Anjul, jayanth and piezocake