His father, "Mirza Mohammad Khan Mostofi Farahani", was from the succession of teachers and accountant of Farahan and his maternal ancestor was "Mirza Soleimaan Bayan ol-Saltaneh Farahani", the head of the royal exchequer and the author of "the treatise on the rules of clerking and accounting".

[7][8][9][10] After passing the training course of the officer's college and military service, Bayani started teaching Persian language and Persian literature in 1933, while working in the library of the "Teachers High College", and in 1934 he was appointed the director of the public library of Islamic sciences.

He was also a professor at the University of Tehran, where he taught "History of the Evolution of Islamic scripts" and "Bibliography of Manuscripts" courses.

[12] The book "Fifty Years with Dr. Mehdi Bayani (Persian: پنجاه سال با دکتر مهدی بیانی)" deals with his life story, photographs and documents, and reviews Bayani's book the "Biography and Works of Calligraphers (Persian: احوال و آثار خوشنویسان)", has been published by the National Library of Iran on the occasion of the fiftieth anniversary of his death in 2018.

[12][2][22][23][24] Lately, a virtual (due to COVID-19 pandemic restrictions) commemoration ceremony of Mehdi Bayani was held by the Society for the National Heritage of Iran on October 21, 2020.