He is a well known and respected figure within the music industry. Ludwig's craftsmanship is appreciated widely within the music profession, as testified by his extensive credits and demand for his work. His name is ubiquitously credited on the covers of albums released across the world, and he has won numerous awards over the years. Throughout his career, he has mastered recordings on all the major recording formats for all the major record labels, and on projects for many important artists such as Jimi Hendrix, Paul McCartney, Madonna, Eric Clapton, David Bowie, Rolling Stones, Kiss, Queen, Mariah Carey, Bruce Springsteen, U2, Metallica, Rush, Led Zeppelin, Nine Inch Nails, Tool, and The Who.
As an 8-year-old child in South Salem, New York, Ludwig was so fascinated with his first tape recorder he used to make recordings of whatever was on the radio. Ludwig is a classical musician by training, having obtained his Bachelor's and Master's degree from the Eastman School of Music, University of Rochester, New York, where he was also involved in the sound department and played Principal Trumpet with the Utica Symphony Orchestra. Inspired by Phil Ramone when he came to the school to teach a summer recording workshop, he ended up working as his assistant. Afterward, he was contacted again and offered work with Ramone at A&R Recording. Together, they did sessions on projects with The Band, Peter, Paul & Mary, Neil Diamond, and Frank Sinatra.
After a few years at A&R, Ludwig received an offer from Sterling Sound, where he eventually rose to become a Vice-President. After seven years at Sterling, he moved to its larger direct competitor, Masterdisk where he was Vice President and Chief Engineer. In 1993, Ludwig decided to take control over his career by starting his own record-mastering facility in Portland, Maine named Gateway Mastering.
His mastering credits are extensive, and include albums for many major classical artists and rock bands alike, including Jimi Hendrix, the Kronos Quartet, Alarm Will Sound, Nirvana, U2, Bryan Ferry, Tori Amos, Jars of Clay, AC/DC, Bonnie Raitt, Paul McCartney, Bruce Springsteen, the Bee Gees, Madonna, Will Ackerman and Dire Straits.
Although he is sometimes involved in long projects, such as remastering the entire back catalogues of Rush, Dire Straits and The Rolling Stones, Ludwig cites his most musically satisfying projects: as the CD reissue of Music From Big Pink (The Band), There's a Riot Goin' On (Sly and the Family Stone), Led Zeppelin II, Painted from Memory (Bacharach & Costello), Spirit (Jewel), Loreena McKennitt, Ancient Voices of Children (George Crumb).
Ludwig has won many Technical Excellence & Creativity (TEC) Awards.
Since the inception of Gateway, Ludwig/Gateway have been regular winners of TEC Award for "Best Mastering Engineer" and "Best Mastering Facility", namely:
In the 48th Annual GRAMMY Awards in 2005, he won an award for the Best Surround Sound Album: - Brothers In Arms - 20th Anniversary Edition, Dire Straits.
"No mastering engineer has mastered more music that has been enjoyed by more people ever than Bob. I can't think of anyone else that might be true of. So there's a start. Simple fact" - Mark Parsons.