A native of New York City, Marshall Sealy began his French horn study at the age of 8 years. As a young musician, he performed with the Long Island Youth Orchestra and attended Manhattan School of Music and Ithaca College, where he received music and soccer scholarships. He then launched a successful second career as a master of brass instrument restoration and modification.
His musical career continued with many performing opportunities such as the show orchestras of Tony Bennett, Sammy Davis, Jr., Melba Moore, and the pit orchestras of The Dance Theatre of Harlem and Alvin Ailey Dance Company. In 1979, Marshall moved to Boston (MA), where he played with the orchestra of the Opera Company of Boston (seven seasons), Boston Pops Orchestra, Les Miserables Brass Band, Aardvark Jazz Orchestra, Boston Jazz Composers Orchestra, and the Boston Lyric Opera Orchestra. He has been a soloist with such organizations as the Mostly Mozart Festival (Vermont), Boston Orchestra and Chorale, and the United States Air Force Band. Additional performing credits include Peter Nero and the Philly Pops Orchestra, The Philadelphia Orchestra, Brooklyn Philharmonic, and the Orchestra Filarmonica de Jalisco in Guadalajara, Mexico.
Since his return to New York, Marshall has played on Broadway in the pit orchestras of Beauty and the Beast, Jekyll & Hyde, and The Lion King. He has also performed with such notable artists as Lester Bowie, J.J. Johnson, Max Roach, David Murray, Shirley Horn, Ray Charles, Paquito D'Rivera and Steve Coleman. Marshall has appeared with the live television studio orchestras of the Essence Awards, Emmy Awards, Grammy Awards, Christmas in Washington, and the Whitney Houston HBO Special.
He can be heard on recordings with Les Miserables Brass Band, George Russell, J.J. Johnson, Max Roach, Oliver Lake, Taj Mahal, Michael Jackson, Anthony Braxton, and Isaac Hayes (in the film score from the 1999 "Shaft"). Marshall has recently completed his new solo horn album, "Horn Song".