Please click on the administrator’s name to get more information about him or her.

Mark Robertson, Music Director


Mark Robertson, concertmaster and co-Music Director, is originally from Fort Wayne, Indiana. Both parents were musical (piano and voice) which led to Mark to picking up the violin at the early age of five. After graduating from Boston University and The Juilliard School, Robertson moved to Los Angeles in 1995, shortly after giving his New York recital debut at Carnegie’s Weill Recital Hall. His violin teachers have included Dorothy DeLay, Kurt Sassmansshaus, Piotr Milewski, and Martin Chalifour. A ten-year alumnus of the Aspen Music Festival, Robertson served as concertmaster of both the Philharmonia Orchestra and the Concert Orchestra under such conductors as James Conlon, Junichi Hirokami, and Murry Sidlin.

While in Los Angeles, Robertson has been guest concertmaster for the Riverside County Philharmonic, the New West Symphony, the Pasadena Pops, and the Culver City Chamber Orchestra. He has also recorded for over 600 movie and television soundtracks, most prominently as concertmaster and solo violinist for the award-winning shows House of Cards and Penny Dreadful.  He also served as concertmaster for the recent and upcoming films One Night in Miami, White Men Can’t Jump, Rather, Big City Greens: Spacecation, The Boogeyman, Strays, The Hunt, Shaft, The Biggest Little Farm, The House with A Clock in Its Walls, Triple Frontier, The Nun, and Under the Silver Lake, in addition to previous films including Baywatch, Pitch Perfect 3, Contagion, Much Ado About Nothing, Ride Along 1 and 2, Premium Rush, Blackfish, Merchants of Doubt, and Horrible Bosses 1 and 2. He has conducted ensembles at the Aspen Music Festival, the Wilshire-Ebell Theater, the Montalban Theatre,  the Coachella Music Festival (Wu-Tang Clan), and for Access Hollywood (Carly Rae Jepsen).   On the pop music side of things, Mark has worked with Logic, A Great Big World & Christina Aguilera, Billy Childs, Daughtry, OneRepublic, the Fray, and Kelly Clarkson, among others. He recently served as concertmaster for Il Volo’s performance at the Dolby Theatre (Hollywood), and for Idina Menzel’s performance at the Hollywood Bowl.


Noah Gladstone, Music Director

Noah Gladstone, trombone and co-Music Director, is a multi faceted musician from Los Angeles. A trombonist at his core, he has performed professionally with the Chicago Symphony Orchestra, Los Angeles Philharmonic, Opera Santa Barbara, New West Symphony, The Hollywood Bowl Orchestra, Juilliard 415 as well as many other world class ensembles. In addition to his orchestral experience, he is a regular figure in the Hollywood studio music scene as a trombonist and a music contractor and has produced music for Showtime/CBS, Riot Games, Microsoft, Imagine Dragons, The Weinstein Company, Brand X Music, as well as other media for TV, film, recording artists, video games and advertising. He also manages the musical personnel of the West Los Angeles Symphony Orchestra, The San Bernardino Symphony and Opera Santa Barbara. He holds a Bachelors and Masters of Music degree from The University of Southern California.

Tim Davis, Director of Choral Activities


Tim Davis has been a force in the Nashville and Los Angeles vocal scenes since 1996. His work as a studio singer, vocal contractor, and vocal arranger has made its mark on hundred of multi-platinum records, network television shows, national commercials, and box office hits.

Tim’s unparalleled standard for excellence and ear for LA’s top vocal talent is seen most notably in his work as vocal contractor and arranger on Fox’s hit series GLEE.

Niki Giermasinski, Director of Social Media

headshot-nikkiNiki Giermasinski is a flutist currently residing in New York City. She received her B.M from Berklee College of Music before joining INDMUSIC as a rights manager in the summer of 2015. During her ten-year career as a musician, Ms. Giermasinski has had multiple performances at Carnegie Hall, Jordan Hall, and Boston’s Symphony Hall both as a soloist and orchestral musician. In addition to performing, Ms. Giermasinski is an enthusiastic traveller with a keen appetite for Asian cuisines. Her recent travels have taken her to Sri Lanka, India, Indonesia, Thailand, Japan, the Seychelles islands, South Africa, and Oman. She is planning a move to Los Angeles in the near future. She can be contacted at ngiermasinski at

Alexandria Grace Williams, Director of Social Media

headshot-alexandriaAlexandria Grace Williamssocial media director, is a classically trained soprano and actress, residing in New York City.  She recently graduated from the Manhattan School of Music, earning her Bachelor of Music Degree in Vocal Performance.  She has also studied at the Stella Adler Studio of Acting and has sung as a soloist at St. Martin-in-the-Fields in London, the Cathedral of St. John the Divine in Manhattan; and has performed with the New York Philharmonic and at the Kennedy Center with the Manhattan School of Music’s Chamber Choir. Alexandria‘s recent credits include Bridgette in “Lizzie Borden: A New Musical”, and Susan in the Theatre Project’s “Plan Alternate Route”.  This past summer, Alexandria performed 9 classic musicals and operettas with the College Light Opera Company in Cape Cod, MA. She is represented by American Talent Management. She is very excited to be part of the HCO’s new family, maintaining their social media presence.

Music Advisory Board

Tree Adams
Tyler Bates
Mike Barry
Jeff Beal
Bruce Broughton
Kenji Bunch
Billy Childs
Scott Clausen
Elia Cmiral
Julia Gaskill
Christopher Guardino
Tim Huling
Matt Hutchinson
Jason Johnson
Christopher Lennertz
Christian Linke
David Low
Deborah Lurie
Joey Newman
Anthony Parnther
Mike Patti
Alison Plante
Lucas Richman
James Sale
Jeffrey Schindler
Tim Simonec