As an actor,
Keymanesh reached widespread recognition on the Iranian theater stages for playing a highly physical grotesque soliloquy, "The Clown and I (Mono Talkhak)" in 2011. Consequently, he was chosen as the Second Best Actor of the year at the 9th Night of Iranian Theater Forum of the Annual Iranian Theater Ceremony.
In 2017,
his portrayal of Puck in Shakespeare's well-known play "A Midsummer Night's Dream" once again enhanced his reputation. Due to the overwhelming interest of the audience, the play was performed one year in a row in Iran, and then later in Poland, India, and the Czech Republic. Nandajan K.A. one of the reviewers of the Krala Sangeeth Nataka Akademi in His critique says that “The acrobatic of the Puck seemed to defy the laws of gravity.” A Midsummer Night’s Dream resulted in Keymanesh being named Best Actor of the Year at the Annual Acting Ceremony of the 14th Iranian Theater Forum's Awards. In addition, he received the International Jury's Laudatory Prize at the 35th Fajr International Theater Festival.

In his early career as an actor,

Keymaneh was a main member of the "84 theater group," where he appeared in the works of playwrights such as Samuel Beckett, Slawomir Merozek, Jean Genet, and David Mamet. His interest in the critical, experimental yet academic, and minimal approach of "84 Theater Group" kept him in a constant collaboration with them for ten years. Besides his proactive activities as an actor, his enthusiasm for learning through sharing led him to the teaching and coaching world since 2009. Later on he shaped the classes in a school format under the name of 33School. In fact, 33School is a decentralized underground theater and dance space in Iran. His approach was against the official institutions, academies, and universities in Iran, which placed the teacher at the center of the teaching process and treated him as an all-knowing figure. Instead, he developed his methodology by portraying the teacher as an ignorant person who is trying to level himself with students and to learn from them simultaneously, as he teaches them. “I do not teach, I perform. Each day of a class is a performance for me. I make myself open to new explorations and I improvise while I am performing.” Keymanesh says,

Following his return to Iran in 2014,

he increased his teaching, choreography, and dance activities, focusing primarily on body-mind techniques he had previously studied in the Netherlands with Eva Karczag, with whom he has continued to enrich his psychophysical explorations up to now. As a result, he introduced and developed the Ideokinesis method in Iran, not only through workshops and lectures, but by translating its books written by André Bernard, Wolfgang Steinmuller, and Ursula Stricker into Persian. Furthermore, he co-founded 33Projects, an underground art organization based in Tehran from 2017 to 2021. Ever since Pandemic, Keymanesh has been developing his psychophysical journeys based on eastern somatic practices through constant virtual sessions with Eva Karczag.