Shri Sunil Bajaj has a 20 years’ service  experience  at SCERT. He has also worked as a resource person with NCERT, NIEPA, HBCSE,  Kendriya Vidyalayas, IGNOU and SIASTE etc. He has presented papers at international and national conferences, for eg. Helsinki University, Finland, ICME 15, NSW university Sydney, IIT, Gandhinagar, HBCSE TIFR Mumbai, RIE NCERT  etc. He was honoured by W/Governor of Haryana for innovative Maths lab at SCERT. He has developed many TLMs, and one TLM Sogol was selected for display in Mathematics lab at HBCSE, TIFR Mumbai and Harbans Puzzles in At Right Angles Azim Prem ji University. He has been an author member for NCERT text books for class 12, Exemplar problems in Mathematics Class 12, Maths Lab Manuel by NCERT  for 11th and 12^th.  He has also been a member of author team for source book of classes 1 and 2 and development of Math kit and module for  classes 1 and 2  by NCERT.  He has reviewed Maths books for NCERT, grades 9th and 11^th. His articles have been published in magazines like Shiksha Saarthi Souvenirs. He is a member of national resource group of FLN by NCERT and Ministry o Education. Articles around the TLMs developed by him like Harbans puzzle, Kashmiri Amrit puzzle and SOGOL are published in Magazine at Right Angles Azim Premji University Bangalore. He is also the coordinator and member of author team for state textbook for classes  1 and 2 and were highly appreciated  by National experts of DU and HBCSE TIFR Mumbai. He looks after the teacher professional development programs at National and State level eg. National PM e-Vidya Channel Kendriya Vidyalaya and private schools. He has also been part of development of animated Maths activities with IIT Delhi.