India commemorates September 5 as National Teachers' Day to honour a philosopher teacher, Dr. Radhakrishnan. Some thoughts on teachers' roles. Teacher's roles change from time to time to accommodate national and global changes. His or her role was solely knowledge imparting in the traditional times. A certified person took the token of a social leader then. A teacher must be in many roles- knowledge imparter, mentor, counsellor, guide, role model, etc. in the present time.