He started his diplomatic career in Ministry of Iran from 1980s. First, Taheri was Consul General in Istanbul and after 5 years he returned home and became the Director of Ministry of Foreign Affairs (M.F.A. ), then he upgraded to Director of Political Office and in 1989 he became Ambassador in New Zealand and after 4 years he returned home and became director of Political Office in M.F.A.
Taheri began his diplomatic career with the Ministry of Iran in the 1980s. He started as Consul General in Istanbul before returning home five years later to become the Director of the Ministry of Foreign Affairs (M.F.A.).  He then moved on to be the Director of Political Office and was appointed Ambassador to New Zealand in 1989, where he served for four years before returning to his role as Director of Political Office at the M.F.A.