He holds two MAs - in Classical Singing from the Jerusalem Academy of Music and Dance, and in Musical Theatre from the Guildford School of Acting (GSA). For over a decade, he has taught at major UK institutions including Urdang Academy, London Studio Centre, ICMT, PPA, and City Lit, and regularly leads workshops across Europe and Israel. He recently joined the teaching staff at the Jerusalem Academy to form a new musical theatre pathway, on which he's teaching a technique focused module. His students perform in professional productions in both countries and around the world.

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Shar is the founder and artistic director of THE JEWish CABARET, a London-based theatre collective creating new musicals and cabaret works since 2016. In November 2025 their evening of new Jewish musicals JEWSicals sold out at the artsdepot theatre. The evening featured nine excerpts of new musical theatre pieces with a cast of 17 performers, and five band members.

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In 2026, as part of a co-production with Echoes Theatre Company, Shar artistically directed the musical aspect of Joyfully Jewish—a production consisting of three nights of new, short comedic plays and original musical theatre songs exploring Jewish identity and connection. Spanning four different London venues, the ambitious run featured three distinct casts, bringing dynamic new musical theatre writing to diverse audiences across the city.

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 As a musical-theatre writer, Shar is a member of London’s BML (Book, Music, Lyrics) program for professional writers. Since 2020, he has collaborated with composer Guy Frati on several projects, including Sonia, which premiered at Haifa Theatre and the Israeli Opera in December 2023. Their piece Grace (חסד) for orchestra, choir, and two soloists premiered in November 2025 with The Revolution Orchestra as part of its season, at the Israeli opera house.

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In 2025, Shar founded Katco, a collaborative community for musical-theatre writers, and is now developing KMI, an initiative to support and promote original Israeli musical theatre.

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As a poet, Shar won first prize in Helicon’s “Mila BaMakom” competition, and his poems have been published widely. His English-language poetry inspired the short film Poetry in Motion – Dew Drops, premiered at the Loud & Queer Festival (Worcester, 2023).