Kim Rosen is a GRAMMY® winning mastering engineer who works out of her own "Knack Mastering" located in Ringwood, NJ, USA.


Kim grew up in the western Massachusetts town of Northampton. Realizing early-on that music was a driving force in her life, Kim poured herself into the local music scene while searching out a way to carve a path for herself. In the summer of 2001 a friend turned her on to a mastering studio in NJ that was looking for an intern. Kim jumped at the opportunity, moved to NJ and began her journey at the age of twenty one.

After a couple of years in production, training and assisting in sessions, Kim was given the opportunity to take on her own mastering projects. Over the next five years, Kim would rack up hundreds of mastering credits including notable projects from Jeremy Enigk, Franz Ferdinand and Dashboard Confessional.


In 2009 Kim welcomed the birth of her first child and decided to build a proper mastering room off the side of her home with the help of world-renowned acoustician Chris Pelonis. The mastering room at Knack is a world-class listening environment, with analog and digital gear carefully chosen for its sound quality as well as its versatility.


Kim now has a growing client list that includes producers and engineers such as Ryan Freeland, Ed Cherney, Joe Henry, Paul Q. Kolderie and independent and major artists from around the world.


Kim’s mastered three Grammy® nominated albums one of which winning in the Best Folk Album category: 2015 nomination - Best Blues Album for Bettye Lavette's "Worthy", 2016 nomination - Best Engineered Album Non-Classical for Bonnie Raitt's "Dig In Deep" and 2017 WIN - Best Folk Album for Aimee Mann's "Mental Illness"


Other recent credits include a diverse spectrum of genres with artists such as Wynonna Judd, Billy Bragg, Joe Henry, Jeff Bridges and the Abiders, Bonnie Raitt, Glen Phillips, Aimee Mann, The Barr Brothers, Superdrag, and Anthony Green.


She was fortunate enough to master the remake of the Johnny Cash album “Bitter Tears” for Sony Masterworks which features artists such as Emmylou Harris, Steve Earl, Kris Kristofferson, Gillian Welch and the Milk Carton Kids as well as the beautiful Rhiannon Giddens and Iron & Wine rendition of “Forever Young” for the final episode of NBC’s television series “Parenthood”.


Kim continues to build a client base of artists, producers, labels and engineers who trust her ears, her experience and, above all, her respect for their mixes.




Raised on a fifty-acre farm in New Douglas, Illinois, Megan Peterson began her journey into the music business as many before her. Performance. Megan was classically trained on piano and decided to further her musical performance education at Millikin University in Decatur, Illinois. She quickly became enamored with the studio side of the business while enrolled in the required “Intro to the Recording Studio” class during her second semester. This would change the course of her studies from a focus on a performance to a focus on a Commercial Music degree.


In November of 2015, Megan was chosen to represent Millikin University at an industry conference in Nashville, TN. Another turning point. It was there she met and had a brief conversation with Kim Rosen, who was speaking on a panel at the event focused on the business of audio mastering. This was an aspect of the business seldom covered in her curriculum. Megan became fascinated with the process and began educating herself on her own while finishing up her degree.


In the summer of 2016 Megan spent a few weeks interning with Kim at Knack, learning the basics, the purpose and the importance of audio mastering. While finishing out her senior year at Millikin, Megan began taking on indie mastering projects and building up her credits including Fireside Relics' latest release, Shot Out The Saddle.


Kim recognized Megan’s passion, drive and ear for mastering and, upon graduation, offered her the opportunity to move to the east coast and continue her journey.


Megan now assists Kim and takes on her own mastering projects at Knack. She rocks.


Contact us for Megan’s mastering rates and availability.

Knack is located in Ringwood, NJ, just 30 minutes from New York City's George Washington bridge. However, in today's age of easy and secure file transmission, Knack has mastering clients from New York to Los Angeles, Nashville to London, Berlin to Bangalore and everywhere in between.


If you'd like to discuss whether Knack is the right fit for your next audio mastering project we'd love to hear from you.


Give us a call...973-556-5749...or shoot us an email.