Dr. Hemant Kumar Mishra, Assistant Professor, Mathematics, Vinoba Bhave University, Hazaribag (Jharkhand), (currently posted at Chatra College, Chatra) is teaching to UG, BCA and PG students since last 15 years. He has qualified CSIR-UGC NET, GATE, etc. examinations. After completing his UG and PG from BHU, the author has done his Ph.D. from VBU, Hazaribag and cleared 3 SWAYAM-NPTEL examinations. He has made more than 250 YouTube lecture videos containing study materials for UG and PG students. He is serving the college at various administrative responsibilities. In his earlier days, the author served as Scout in several activities. A number of writings are due to his credit in Prabhat Khabar newspaper. He is a life member of ISCA, ILA, IMS, MS-BHU etc.