Mary Mar Keenan - Designer/Owner

MMclay is a handmade tableware business run by local ceramic artist and designer, Mary Mar Keenan, in her Hayes Valley studio in San Francisco. Mary Mar's pottery is used throughout many popular restaurants, and as a result, has become highly desirable tableware throughout private home collections as well. 

In 2014, she designed and produced a collection of work for Stuart Brioza's (James Beard Award Winner Best Chef: West) most recent venture, The Progress. From this collaboration The Progress Collection was developed and has been featured in Food and Wine Magazine, Remodelista, Saveur, San Francisco Magazine and many others. 

Mary Mar has also produced tableware for an array of other top-tier restaurants in the Bay Area and other cities in the U.S., including Nightbird (SF), Single Thread Farms (Healdsburg), A16 (SF and Rockridge), Octavia (SF), BearCat (New Orleans), Wildhawk (SF), BirdDog (Palo Alto), Alloy (Miami), Goose & Gander (St. Helena), Bellota (SF), Pendulum (Vail), and a variety of smaller projects/collections. For more information, collaboration opportunities and more, email me today!


Kristof Puchner

Business & Operations Manager

Kristof is MMclay’s General Business & Operations Manager. Kristof's main focus is growing the business with new partnerships, while fulfilling operational needs: promoting and maintaining digital media; new and growing partnerships (hotel, restaurant, social); order fulfillment - both online and offline - all while juggling the creative side of the business as production potter and gas kiln operator. 

With over a decade in Sales and Marketing experience, Kristof's curiosity with ceramics began in his late teens, lending an ideal blend of creativity and business sense to MMClay. 


Sarah Duyer

Studio Lead

Sarah Duyer is a San Francisco-based ceramic artist and illustrator. As Studio Lead, Sarah manages incoming orders and production in the studio. Outside of the MMClay studio, Sarah makes her own line of functional and sculptural ceramics she sells online and in stores around the Bay Area. You can find her work at


William Mantor

Studio Assistant

William Mantor is originally from Oklahoma. He came to San Francisco in 2014 to continue his education by earning his masters in Fine Art from San Francisco Art Institute. His past experience in fabrication shops has helped enhance his abilities as a sculptural artist and the focus of his artwork is minimal forms with architectural inspirations. In addition to his day-to-day hours at MMclay Studio, he is currently teaching ceramic courses at Clay By The Bay and creating his own sculptural art. You can find his work at:

Rosy Raizen.jpg

Rosy Raizen

Studio Assistant

Rosie is a multi-disciplinary artist creating everything from dance to watercolor to ceramics. She works in production and sales at MMClay where she mixes glaze, creates pieces, and sells pottery at the airstream retail location. She also creates her own work with Wild Thing Ceramics in her studio in Oakland. 

Site Credits:
Photography - Kiera Condrey, Dennis The Prescott, Madelene Farin, Zoe Armbruster, Monica Lo,
Nader Khouri, and Chef Melissa King. 
Design and Photography - Gecko Graphics