He established Saeb Literary Association in Isfahan in young age. He went to the capital Tehran in 1960, and got his Bachelor"s degree from University of Tehran, and his Masters degree in Economy. In 1966, he left Iran for continuing education in Great Britain.
In 1972, he got his Administrative Law degree from National University and became an assistant professor at University of Tehran and Kerman University, teaching several courses in Research Methods.
Besides working as a lawyer, he continued writing poems and publishing some of them. His career as a lawyer was strongly affected by his life as a poet and his political concerns.
Most of his defendants were other Iranian authors and artists, such as Simin Behbahani, another famous Iranian poet. His most famous book is a collection of his poems during 70s, called "Abi, khakestari, siah" (Blue, Gray, and Black).
This collection is not just romantic, but also social and political, revealing the emotions, hopes and dreams of Iranian youth during 70s.
They have two daughters named Ghazal and Taraneh. In the words of critics one of the distinctive features of his poems is simplicity, fluency and sincerity. As Simin Behbahani argued: "Mosaddegh associated (Iranian"s) humanistic goals with poetry." Hamid Mosaddegh was close to the heart of Iranian people and his poems are understandable and easy to connect with for people of various ages and classes.
In 1998, he died at Day Hospital in Tehran because of medical complications after a heart attack.
He is buried in "Ghate"ye Honarmandan" in Tehran. On his tombstone it has been written: "Remember us, whom in all life"s night, Prowl for searching twilight.
Remember us kindly and by heart." The words are from one of his last poems in "Shir-e-Sorkh", which talks mostly with Iranian youth, giving them hope for a better future, asking them to remember those who worked for the better future in the country but did not make it to see the coming bright days.
From 1981, he began teaching law, especially Cooperative Law, becoming a faculty member of Law School of University of Tehran and Allameh Tabatabaie University. He was a lawyer of Iranian Administration of Justice, member of the Bar Association and editor in chief of Journal of Association.