Working principally in Baltimore, Los Angeles, Nashville, and Macon, Georgia, Massenburg is widely known for submitting a paper to the Audio Engineering Society in 1972 regarding the parametric equalizer.
Massenburg authored a technical paper entitled "parametric equalization" which was presented at the 42nd convention of the Audio Engineering Society in 1972.
His work includes recordings of Earth, Wind & Fire, James Taylor, Billy Joel, Toto, Dixie Chicks, Journey, Madeleine Peyroux, Little Feat, Weather Report, Randy Newman, Valerie Carter, Lyle Lovett, Aaron Neville, Kenny Loggins, Mary Chapin Carpenter, Linda Ronstadt, Herbie Hancock, The Seldom Scene, and many more.
In addition, he has contributed to the acoustical and architectural design of many other studios, including Skywalker Sound and The Site in Marin County, California.
She and Massenburg live in Montreal, Quebec, Franklin, Tennessee and Mabou, Cape Breton, Nova Scotia.