Ashok Kumar Chauhan is currently working as Director, Professor and Head Radiotherapy Unit-II, He worked as Professor in Department of Radiotherapy, PGIMS,Rohtak .He attended and participated in 80 national and international conferences. He is author/co-author to 45 papers. He Published articles in nearly about 90National and international journals. He also attends as an examiner for Postgraduate examinations in various universities in India. He is a Supervisor for 28 Postgraduate students for thesis/ dissertation. He is Life member of Association of Radiation Oncologist of India (AROI) and many other societies and associations.