Katie Martinez Design offers full service interior design from concept to installation. Through close collaborations with visionary architects, builders, and skilled craftsmen, KMD interprets each client’s vision through the filter of their practical needs to create stirring, distinctive spaces. With offices in San Francisco and New England, KMD serves clients across the country with interiors that span styles, transcend trend, and work in real life.

Katie Martinez

Katie is committed to designing interiors that are equally beautiful, functional, and livable. She approaches projects with order, organization, and a focused process that turns out effortless spaces with an undone feel. A medium for each client’s style, Katie draws out their unique preferences through collaboration and dialogue over the life of each project.

An East Coast native, Katie cut her teeth in New York at André Balazs and Rockwell Group before heeding the call of the West and moving to San Francisco. There, she worked at Wiseman Group and Nicole Hollis before establishing Katie Martinez Design in 2013. Katie has a BFA in Art and Art History from Dartmouth College and an Interior Design degree from Parsons School of Design. She lives in Ipswich, MA with her husband and two daughters and frequently travels to KMD’s San Francisco office for West Coast projects.

Marta Johansen
Sr. Designer

Marta spent her early childhood based in Pakistan, where her American mother consulted with UNIDO to assist textile artisans and her Norwegian father oversaw engineering railroad systems throughout Asia. Her parents fell in love with an old farmhouse, while visiting family, in Vermont, and Marta spent her remaining childhood based there. After graduating from architecture school at the University of Southern California, Marta remained in Los Angeles to work with Frederick Fisher and Partners designing public arts spaces and then taught drawing and architecture at USC and Cal Poly Pomona. When she moved to San Francisco in 2010, she began working as an interior designer for Nicole Hollis and later as a senior designer at Studio Collins Weir.

Marta believes in approaching spaces holistically, examining how people live inside those spaces, and layering pieces over time to create harmonious, lasting design. In addition to her interior’s work, Marta is a fine artist specializing in ink drawings and graphics.

Stefanie Sillin

Despite her affinity for beauty, building and craft, Stefanie was initially swept into tech after graduating from San Francisco State with a Bachelor’s in Communications. On her weekends, wandering  through inspiring places including The Art Institute of Chicago stoked her interest in light, space, and design. Eventually, she left her tech job and returned to the Bay Area where she studied Interior and Architectural Design at Berkeley. As a designer at KMD, she understands that there is more to interiors than meets the eye; to evoke a mood or feeling, she begins with the functions of a space and then asks, how would you like to feel here?

Kelly Berger

Kelly’s love of art, architecture and interiors stem from time spent at the Des Moines Art Center as a girl. After class, she roamed free range for hours in the museum’s distinct wings designed by Richard Meier, I. M. Pei, Eliel Saarinen. Kelly studied art at the University of Iowa where she earned a BFA in Painting and Drawing and went on to earn a Master of Architecture at University of Pennsylvania. Before joining KMD, she worked at San Francisco architecture firms EHDD and Mark Cavagnero Associates. Kelly’s interest gravitated to interiors as she realized that true equilibrium results from a balance between architecture, light, color, texture, and furniture.

Amanda Peterson
Jr. Designer

From an early age Amanda was influenced by 19th century homes, finding inspiration in the craftsmanship and details of historic buildings in her Connecticut hometown. After graduating from Suffolk University with a BA in Interior Design, Amanda began her career working for Crate & Barrel and Wayfair in product curation and brand design. Ultimately, Amanda transitioned to interior design as she enjoys connecting with clients, learning their stories, and translating those experiences into stirring, personal spaces. Amanda also finds inspiration in her adopted hometown of Gloucester MA, where she lives with her rescue cat, Fig.