Sachin M. Vyavahare is an M. Phil. In Mathematics from Shivaji University, Kolhapur (MH). He is currently working as Associate Professor at Tolani Maritime Institute, Pune. He is the author of five books Where Mathematics goes wrong (2014), Puzzles: Exercises for Your Brain (2015), Mathematical Formulae with Worksheets: An Essential Guide for 11th and 12th standard students (2016), Merchant Navy Entrance Exams : A Guid to CET Perparation for Maritime Courses (2019) and Applied Mathematics For Diploma in Nautical Science (2019). He has experience of teaching industries at Wipro, Mahindra Vehicle Manufacturers Ltd. And Tata Motors Ltd. He has participated in more than 23 National / International conferences and seminars. He has also published 9 research papers in various national and international journals.