Dr Dey stood 5th in the state of  West Bengal in the Secondary Examination and 15th in the Higher Secondary Examination. He was awarded Sir J C Bose National Science Talent Search  Scholarship in 1989. Dr Dey graduated with Honours and Gold Medals in 1995 from the University of Calcutta. He received Gold Medal in Medicine and other subjects,  and won a number of medals and prizes including J B Mukherjee  Medal, A Chowrashi Medal, Dr A K Basu Memorial medal  in Medicine, and Tilottoma Chatterjee Endowment Award. He received the Indian Council of Medical Research (ICMR) Small Project grant as an undergraduate student. He was awarded MD in Internal Medicine from the IPGMER and SSKM Hospital, Calcutta in 1999. He received the coveted IPGMER Gold Medal. 

He moved to England in 1999 and successfully completed the MRCP(UK) in

2001 and became the Member of the Royal College of Physicians, London. He

has been trained in Neurology and Clinical Neurophysiology and has had the

opportunity to work at several  premier institutes and hospitals in London

including the The Royal London and St Bartholomews Hospital,  Guy's and St

Thomas' Hospital, Queen Mary's Hospital Sidcup. He has also received

training at the renowned Institute of Neurology, Queens Square.

Dr Dey is a member of the Association of British Neurologists (ABN), British

Association of Stroke Physicians (BASP), Indian Stroke Association, and

International League Against Epilepsy (ILAE), UK Chapter