Mehdi Akhavān-Sāles (Persian: مهدی اخوان ثالث‎), or Akhavān-Sāless (1928, Mashhad, Iran — 1990, Tehran, Iran), pen name M. Omid (م. امید, Hope) was a prominent Iranian poet. He is one of the pioneers of Free Verse (New Style Poetry) in Persian language.

Poetry

• Organ (Arghanoon ارغنون, 1951)
• Winter (Zemestān زمستان, 1956)
• The Ending of Shahnameh (Ākhare Shāhnāmeh, آخر شاهنامه, 1959)
• From This Avesta (Az In Avestā, 1965, از اين اوستا)

​Books

• They Say That Ferdowsi (Guyand Ki Ferdowsi, 1976)
• An Ancient Tree and the Forest (Derakhti pir va jangal, درخت پير و جنگل, 1977)
• Nima Yushij‘s Innovations and Aesthetics (Bed’athā va Badāye’i Nimā Yushij, بدعت ها و بدايع نيما يوشيج, 1979)
• Nima Yushij’s Bequest (Atā va Laqā-i Nimā Yushij, عطا و لقاي نيما يوشيج, 1983)​
• Garden without leaves

https://en.wikipedia.org/wiki/Mehdi_Akhavan-Sales