Lemmer performs traditional Hebrew liturgy, Yiddish folk, opera, Broadway, Israeli, and Hasidic music.

Lemmer currently serves as Head Cantor of Lincoln Square Synagogue, a Modern Orthodox congregation in New York City.

[1] Lemmer first received formal cantorial training in 2005 at Young Israel Beth El of Borough Park, under cantor Benzion Miller.

In February 2007, while participating as guest Cantor in a post-Tu Bishvat concert at Young Israel Beth El of Borough Park, Lemmer was recorded performing “Misratze B'rachmim.” This video was uploaded to YouTube.

[3] Lemmer has performed in concerts and ceremonies in Poland, England, Israel, Germany, Denmark, France, Belgium, and throughout the United States.

On December 20, 2011, Lemmer joined cantors Yaakov Motzen and Jeffrey Nadel to sing traditional Hanukkah songs with the United States Marine Band.

The song and video, written by filmmaker Cecelia Margules, a daughter of Holocaust survivors, depict a Jewish family in Poland before World War II.