Prof. Raj Kumar currently Director Vallabhbhai Patel Chest Institute, a premier postgraduate medical institute devoted to research, teaching and patient care. He is also the Head, Department of Pulmonary Medicine, VP Chest Institute; Head-National Centre of Respiratory Allergy, Asthma & Immunology, Coordinator of National Tobacco Quitline Services, and Head of Department of Pulmonary Medicine, Faculty of Medical Sciences, University of Delhi for two consecutive terms. Chairman of WUS Health Centers, University of Delhi. Member of the pulmonary specialty Committee of Ayushman Bharat Pradhan Mantri Jan Arogya Yojana,.Visitors Nomini for nagaland University 

He is the Fellow of major scientific organisations in the field of Pulmonary Medicine, like National Academy of Medical Sciences, International Medical Sciences Academy, National College of Chest Physicians of India, Indian Chest Society, Indian College of Allergy, Asthma and Immunology. He was the Vice President of Indian Association of Allergy, Asthma & Immunology and is Secretary of Society of Tobacco Control, Treasurer of South Asia Association of Allergy, Asthma & Immunology, Joint Secretary of South Asia Thoracic Society, Governing Body Member of National College of Chest Physicians of India (NCCP-I). 

He is, Member of more than 25 national and International scientific organisations including National Science Academy (NASI), National Academy of Medical Sciences. 

He has over 447 publications including research papers with 2179 Citations, h-index of 26, i10-index of 46. Author and editor of 18 books, 20 abstract books, and newsletters. Supervised 37 Research thesis. He is Editor-in-Chief, Indian Journal of Chest Diseases and Allied Sciences, 

His outstanding work has been recognized in the form of 23 National and 07 International awards. To name a few-World No Tobacco Day Award- 2019 by World Health Organization (WHO) for outstanding work in Tobacco Control; David A and Julie A Steven Scholar Award in 2006 Greece, France.