Composer Leah Muir’s music has been performed by many international venues such as the Deutsche Oper Berlin, Bruckner Orchester Linz with Dennis Russell Davies and David Friedman, the Münchener Biennale, Wien Modern, MärzMusik, Academy Schloss Solitude, Wiener Konzerthaus, Konzerthaus Berlin, the Aspen Music Festival, June in Buffalo, Matera Festival, Heroines of Sound, Ars Electronica, Soundtrack Cologne, as well as many established new music ensembles and soloists. She was chosen for the Artist Residency in Venice 2019 at the Deutschen Studienzentrum. Other important residencies include a Fulbright where she studied with Chaya Czernowin at the University of Music and Performing Arts, Vienna.

In Berlin, she is a guest professor at the Berlin University of the arts where she is the Artistic Directer and co-founder of Ensemble ilinx, Studio for New Music at the Berlin University of the Arts in conjunction with Prof. Elena Mendoza. Ensemble ilinx plays repertoire from the 20th and 21st century whereas the concert series Zoom + Focus is only for student composers, where over 30 new compositions from students premiered each year. Many of these productions are in collaboration with Klangzeitort—Institut für Neue Musik UdK HfM, an organization of the Berlin University of Arts and the Hanns Eisler Conservatory, which sponsors new music concerts and other transmedial productions of which she is also a member of. She has been on the faculty of the Berlin Stanford Undergrad Bing Overseas Program since 2019.

Aside from composing purely acoustic music for orchestra, small ensembles and solists, Muir's own multimedial work include "Von Sodom und Gomorra nach Berlin" premiered in 2012 at the Münchener Biennale as well as "Neue Szenen" prize at the Deutsche Oper, for the piece "Wie man findet, was man nicht sucht", premiered in April of 2013. She has worked on films such as "8 to 8" first shown at the Matera festival has been developing video projects with talented soloists, including the latest music video filmed in Venice, "Private Sponsor I". "Lost Time" was composed in conjunction with Chihura Shiota's installation at the Stadtmuseum Nikolaikirche in Berlin.