Born in Israel 1995.  Ostrun Guy began studying music at the Israeli Conservatory of Music named after "Shtriker" in Tel Aviv at the age of 9 ; he continued his musical education in the class of Vag Papian, a renowned conductor and a brilliant virtuoso pianist, who has been a former piano teacher at the Buchmann- Mehta School Of Music, in Tel Aviv University.

Guy also studied in the class of Mrs. Lea Agmon, director and teacher at the Jerusalem Conservatory of Music and Dance attached to the Jerusalem Academy of Music for 5 years.

In April 2012 on the occasion of celebrating the Israel Independence Day, Guy and his twin brother Alon were invited to perform as a Duo in 4 hands in Hong Kong.

In March 2011 Guy performed in London as part of the evening event organized by the Jewish community with the Israeli embassy in England for the cancer stricken Israeli children. Moreover, in 2011-2018 Guy took part in " Tel- Hai" international piano Master Classes, in Sde Boker, Midreshet Ben Gurion in the south

. During the course he studied in the workshop of the acclaimed brilliant piano duo Yuval Admony and Tami Kanazawa.  Guy also took lessons from such well known piano pedagogues as: Prf. Assaf Zohar, Prof. Victor Dereivianko, Prof. Vladimir Tropp, Prof. Tatiana Zelikman, Prof. Tomer Lev, Prof. Dmitri Bashkirov, Prof. Emmanuel Krassovsky  and many others.

Guy has finished his regular studies in the multidisciplinary Amal " Lady Davis " high school in Tel Aviv .

During Guy's studies in Jerusalem he performed in concerts with outstanding young pianists as part of the excellence program "Edward Aldwell" which took place in Meeshkenot Sha'ananim culture auditorium and also in the Jerusalem Conservatory of Music ; these concerts were broadcasted live by the " Kol H- Muizka" ( " Voice of Music") radio station. As part of the Aldwell program, Guy took part in many master classes for well known personas such as Mrs. Sonia Rubinsky, Dr. David Dolan, Dr. Robert Levin, Dr. Joseph Kalichstein, Prof. Tomer lev, Prof. Assaf Zohar, Prof. Alexander Tamir, Prof Emmanuel krassovsky, Prof. Andrei Yiczinsky( teacher of Christian Zimmerman ) and others.

In 2011 Guy took part in the Israeli piano duo Festival led by Mr. Yuval Admony and Mrs. Tami Kanazawa.

In 2017 Guy and Alon took part in the class of Yuval and Tami Kanazawa course in Piano Duo, only specializing as an ensemble.

In 2013 guy was admitted to the Buchmann - Mehta School Of Music. Guy has finished his BA studies in the classes of Prof. Emmanuel Krassovsky and in the class of Prof. Arnon Erez. Short after his BA graduation, guy continued his MA studies in the class of Prof. Arnon Erez making a collaborative work with his twin brother, Alon Ostrun. Guy finished his MA studies with honor under the guidance and the caring work  of the respected Duo  Mr.Yuval Admony and  Mrs.Tami kanazawa, a duo which supported my brother and my self during our long path- starting from the very youth till today  of becoming a professional piano  duo- their effort and devotion of hard  work will always be in our hearts for ever.

In 2015, Guy and Alon were invited to perform for the Israeli president - Reuven Rivlin, at the presidency residence in Jerusalem.

In 2017 Guy and Alon were invited to play as a duo in "Heichal Hatarbut", in Charles Bronfman famous concert hall in Tel Aviv.

Guy has been given excellence scholarships in a row in all his 6 years of studies from Buchman -Mehta School of Music.

Guy has been a recipient of the " Ronen foundation " since 2017 till today.

In addition Guy has received Scholarships from the Buchmann - HEIMAN foundation for promoting outstanding young musicians since 2018.

In December 2019, Guy won 3rd prize at the Chopin Roma piano international competition along with his  Alon Ostrun- Duo section ( 2 pianos).