Born in New York to Korean and German parents, she first sang publicly at age 2, began playing piano at age 5 and joined rock bands as a young teen. She worked with teachers from the Juilliard School as a teen; her focus on Classical music led to numerous piano recitals and learning to arrange and compose instrumental music. She has performed internationally since her teenage years when she was both lead singer for the punk band "Kikigurushii" in Kyoto, Japan and concert pianist in the United States.
CNN presented Miss Reimann and Grammy-nominated violist Paul Coletti's performances and arrangements of Astor Piazzolla via live broadcast from the Argentine Consulate General; their live performances were also heard internationally. Venues include Lincoln Center, the Bitter End, Knitting Factory, Cutting Room, Grand Canyon Music Festival, Bargemusic and many others for her work as a piano soloist, chamber musician, singer-songwriter and rock musician including accordion with the all-female Main Squeeze Accordion Orchestra, keys and vocals with the indie Rock bands Last Tango, Loaded Dreams, and various other local New York ensembles.
Her CD "First Songs," introduced her “Extraordinary voice” (XM Satellite Radio) and songwriting “a beautiful CD from a beautiful soul.“ (Jim Brenholts, AllMusic.com).
As a filmmaker, she has created her own music videos since 1996. Her first short film, “Destroying Angel,” was shown at the Long Island International Film Expo and the New Jersey Film Festival in 2011 and 2012.
As a film actor, Hannah has appeared in over 20 independent films including the award-winning "The Wounded & the Slain" and “Things I Don’t Understand.”
Theater credits include Musical Director and vocal soloist for two sold-out runs of "American Clock" (Arthur Miller, dir. Austin Pendleton), composer for "The Quick Change Room" (Nagel Jackson), and "A Chorus Girl" by Anton Chekhov, all at New York's HB Playwright's Theater. She attended HB Studio to work with Austin Pendleton, who is featured as an actor in her movie, My Father’s House.
Her teaching studios in New York City and New Jersey for aspiring singers and pianists spans, like her own repertoire, from Classical to Jazz, Pop, R&B, Broadway, Singer-songwriter and Rock. Her young students have landed Principal roles in Disney's "Mary Poppins,” Broadway "The Boy from Oz," and Off-Broadway “South Pacific,” among many other productions. She is currently at work writing her first instructional books for student pianists and singers.