Rajan joined the Department of Physiology at Monash University in 1987 as a research fellow, becoming a lecturer in 1995. He served as the Director of Education for the School of Biomedical Sciences from 2013 to 2016. He has received numerous teaching awards[2][3] and popular student recognition[4] for his efforts in education and has been a proponent of digital technologies in higher education.[5] He is a board member of the Australian Data Science Education Institute.[6] Since 2017, he has served as the national coordinator of the Australian competition of the International Brain Bee for high school students.[7][8] Rajan serves on the advisory boards of the Eisdell Moore Centre[9] and Redenlab.[10]