Certified Instructors


Mary Sullivan Kelly


Mary opened True Pilates Boston in order to bring authentic classical Pilates to the area.  Her goal is to provide a supportive and challenging environment that honors Joseph Pilates' intent: "complete coordination of body, mind, and spirit."

Mary is passionate about the Pilates method and the benefits it provides people from all walks of life and at all levels of physical fitness. She is awed by the many ‘light bulb’ moments this system provides, and the opportunity to see an exercise each day from a new vantage point.

Mary has always enjoyed movement, or at least being on the move. That said, her dance background is more Elaine Benes than Martha Graham.

She received her certification from Romana's Pilates, under the instruction of the world-class trainers at True Pilates New York and employing techniques that are as close to the original teaching of Joseph Pilates as are available anywhere.

Mary holds a BA from Simmons College and an MBA from Boston University. She has three wonderful children and a sometimes less than wonderful dog.




Karen is a certified Level V Romana’s Pilates instructor. She received her certification from Pilates Elder Romana Kryzanowska and Sari Mejia Santo at True Pilates New York in 2009. In addition, she has trained with the highest level Romana’s Pilates instructors including Cynthia Shipley, Janice Dulak,  Kyra Strasberg and Jerome Weinberg in the traditional method as devised by Joseph Pilates.

Karen is also a musician and a member of the administration of the Boston Symphony Orchestra. After years of aerobic and weight training, combined with musical practice resulted in hip, knee and shoulder problems, Karen discovered the healing properties of the mind/body method of exercise developed by Joseph Pilates. She sees Pilates as a discipline, learning to move from the center of the body and engaging one’s mind to stretch, gain strength and control the body, in much the same way as music is a discipline.

Most recently, Karen began work with Janice Dulak on a certification in Pilates for the Dressage Rider, and is now an Assistant Instructor in the method which teaches riders how to use their bodies to help them achieve harmony in movement with their horses.

Karen is the Associate Director for Faculty and Guest Artists at the Tanglewood Music Center (the Boston Symphony Orchestra's academy for advanced musical study) and received degrees in Performance and Music Education from the New England Conservatory of Music.