Board of Trustees


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Amy Jonak

Chair Board

Committees: Finance; Development, Audit, Governance (ex officio)

Amy is the parent of Sophie Jonak, TMS 2016.  Amy spent 25 years on the East Coast in editorial development, marketing, and production for book publishers and developers including McGraw-Hill, International Masters, Time Life, Roundtable Press, and her own company, LA Press.


Since moving to Marin in 2000, she has devoted her time to volunteer and board positions focused on education. In the San Rafael City Schools, Amy served as PTA president of Sun Valley elementary and Davidson middle schools. She served on SRCS’s Superintendent’s Parents Council and Roadmap to the Future Committee. In addition to her role as TMS board chair, Amy sits on the executive boards of HeadsUp, the San Rafael Public Education Foundation (past president), and the Marin Chinese Cultural Association. 


A graduate of a k-12 independent school in Virginia, Amy received her BA in English from the College of William and Mary. She lives in San Rafael with partner Mary Herald and daughter Sophie (when she can make it home from CSU Fullerton). 


Thesia Bowo

Amy Jonak

Committees: Development, Finance

Thesia Bowo, mother of Jameela Bowo a TMS Sophomore, is President of Pacific Bay Ventures an SF based company that invests, manages and develops commercial and residential real estate.


Jameela and her two sisters, all attended Katherine Delmar Burke School in San Francisco.  The entire family was actively engaged with Burke.

Thesia served as Fundraising Co-Chair and also spent five years co- chairing a very aggressive and successful Capital Campaign.

Thesia also served in an annual Cate fundraising campaign at Cate Boarding school where another daughter attends and has also served as Class Rep for the TMS annual fund.


Thesia was born in Indiana and grew up in Indonesia. She received her Bachelor's Degree  in Finance from Trisakti University in Jakarta, Indonesia. Thesia currently resides in San Francisco, CA along with her husband, Ambi, their three daughters, Almira, Jameela and Aleema and their adorable dog, Koda.


Joan Murphy 

Chair Board

Committees: Audit

Joan lives in San Rafael with her husband, Mark LeVine.  They have two daughters, Kendra (TMS 2016) and Marina.  Joan is a retired audit partner from PricewaterhouseCoopers LLP where she spent her career serving primarily educational, nonprofit and governmental organizations.  In addition to serving on the TMS board, Joan serves on the board of the San Francisco Zoological Society as well as the Novato Horsemen Inc.  She is a graduate of Sonoma State University.

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cAROLYN sasser

TMS Director of HR, Finance 

Committees: Audit, Development, Finance, Governance (ex officio)

I started my career in public accounting in San Francisco. After obtaining my CPA, I moved to RREEF, a commercial real estate investment company. I worked there for 17 years, eventually becoming Vice-President of Client Relations where I was responsible for reporting the performance returns on clients’ investments. In 1994, I had my son and began to rethink my career in the corporate world. I was interested in using my business and accounting skills in a way that gave back to the

community. In 1997, I started working at Children’s Day School, in San Francisco. I worked there for two years and realized that I enjoyed working in the school environment.


I became interested in working for a larger school, and in 1999 I became Director of Finance and Operations at San Francisco Day School, a school with 400 students in grades K-8. I worked for SFDS for 15 years. In June 2015, I retired and looked forward to no more commuting from Marin into the city.


In November 2015, I received a call from Head of School Barbara Brown to see if I might be interested in coming back to work at TMS. Having just retired, I was hesitant; however I also missed the sense of community that working in a school offers. I met Barb, the faculty and staff, and saw the campus (which was only a 15 minute commute from my home) and realized that this was a community I would like to be a part of.


I now work part-time at TMS, once again fulfilling my desire to bring my skills to an organization that gives back to the community. Yes, numbers are a significant part of

my work, however being able to work in this wonderful community is the best part of my job.

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Kathryn VanDyke

Amy Jonak

Committees: Development

Kathryn Van Dyke lives in Marin with her husband and two children. Her son is a TMS alum, class of 2019. Kathryn is a private investor. She is currently a trustee of the Layton Art Collection and served six years on the board of the Headlands Center for the Arts. Kathryn received a BA from UC Berkeley and an MFA from Yale University.


diane whitlow

Amy Jonak

Committees: Development, Finance

Diane Whitlow, parent of a daughter in the class of 2021, is a Vice President at Element Public Relations, a boutique PR agency focusing on the intersection of science and technology. 


Diane’s experience with small independent schools started in high school where she graduated from LaLumiere School, a boarding school in the Midwest. She has been an active volunteer at her children’s elementary, middle and high schools. While her children were in elementary school in the San Francisco Unified School District, she served as fundraising chair for two years, and auction chair for another two years. She also served on the communications committee at San Francisco Friends School.  


Diane received a master’s degree in International Communications from the School of International Service at American University, and a bachelor’s degree in Spanish with a minor in Business from Indiana University. Diane currently lives in San Francisco, CA.

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Jennifer Bonvechio

Development Coordinator 

Committees: Audit, Finance

Jen lives in Marin with her two children, Jackson and Olivia (TMS 2023). She brings with her over twenty years of financial experience.  Prior to joining Baker Street Advisors, LLC, Jen worked at my CFO as a Principal in the Investment Advisory Services Group, as well as PricewaterhouseCoopers, LLC in the Asset Management Consulting Practice and the Personal Financial Services Group. 


Jen holds an MBA, with a concentration in Finance and Taxation, from the University of Notre Dame’s Mendoza College of Business and a B.S. in Accounting and Finance from the University of Notre Dame dience's attention.

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Ben Griggs

Ex Officio Member

Committees: Audit, Development, Finance, Governance (all ex officio)

I grew up in Half Moon Bay, California, and have lived in the Bay Area for most of my life. I spent my college years in Massachusetts, graduating from Amherst College in 2003 with a BA in American Studies. After a stint in the newspaper business at the Washington Post in DC, I returned to the Bay Area to become a high school English and music teacher. I was originally drawn to working in education because of the many wonderful teachers who inspired me throughout my educational development—particularly in high school. I would not be the person that I am today without those great teachers, and I have deep gratitude for them. Though being an educator entails endless challenges, I have found no shortage of reward in it. In particular, the connections I’ve made with students through teaching, tutoring, mentoring, and counseling have given me so much. I also love to see young people succeed, particularly when the success has not come so naturally or easily.

Teaching at Mid-Peninsula High School in Menlo Park was highly instructional, particularly in opening my eyes to the reality that fostering students’ social-emotional growth is essential for creating a fruitful learning environment. I also loved mentoring students in advisory, and enjoyed the kind of “counseling on the fly” that often happens in a small school.

So, after five years as a teacher, I decided that I wanted to shift to a more social-emotional and psychological domain, and I entered UC Berkeley’s School Psychology program in the Graduate School of Education. In graduate school, I studied human development, counseling, teacher consultation, psycho-educational testing, as well as academic theory and research in a variety of educational fields. After working at the SEL-focused Nueva School in San Mateo, I’m now very happy to put what I’ve learned to work at The Marin School!

When I’m not at TMS, you’ll most likely find me playing the guitar and writing songs. I have played in various rock bands for well over ten years now, and have spent many hours playing, recording and sometimes even touring. I live with my partner Whitney in Oakland, where we enjoy hiking, cycling, and finding great new places to eat.


keli honsberger

Development CoordinatorT

Committees: Development (ex officio)

I am thrilled to continue to be a part of the TMS community as Development Coordinator and to work for a school that values individualized educational experiences. Originally from Cleveland, Ohio, I have lived in the Bay area since 1975.  I attended San Francisco State University and in 2011 became an ACE Certified Personal Trainer.

For 15 years I worked for a hedge fund handling trades and back office management. In 2009 I started working for an education foundation that I had previously volunteered with. Switching from a volunteer to employee gave me a unique perspective into the role of fundraising for schools; the importance of collaboration, flexibility, managing and supporting campaigns and events. The most rewarding part of my job was being able provide programs and services that would not have been available but for the efforts of our organization and volunteers. I’m happy to bring my experience to TMS and to work with the parents, families, alumni, Trustees and staff!

Outside of school, I live in San Rafael with my husband, two children (one in college and one in middle school) and our three cats. In the early pre-dawn hours you’ll find me teaching my outdoor boot-camp class and in my spare time I like to run, play Mah-jongg with a group of friends and spend time with my family. And my cats, of course.


Kendall Nash, MD

Amy Jonak

Committees: Audit, Finance

Joan lives in San Rafael with her husband, Mark LeVine.  They have two daughters, Kendra (TMS 2016) and Marina.  Joan is a retired audit partner from PricewaterhouseCoopers LLP where she spent her career serving primarily educational, nonprofit and governmental organizations.  In addition to serving on the TMS board, Joan serves on the board of the San Francisco Zoological Society as well as the Novato Horsemen Inc.  She is a graduate of Sonoma State University.


Cassandra Vieten

Amy Jonak

Committees: Development

Cassandra Vieten is a nonprofit executive, psychologist, mind-body medicine and consciousness researcher, and internationally recognized scientist, author, public speaker, and workshop leader.  She is most interested in discovering what catalyzes profound shifts in consciousness that lead to action for the thriving of self, others, and the planet.  Cassandra is parent to Indigo Vieten, TMS Class of 2019.

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