Board of Directors

Mike Rippey, President

Was president of the Ruth Bancroft Garden Board from 2011 through 2015 and reappointed in 2019.  Mike was a major donor to the Visitor and Education Center and has helped the Garden raise its membership from 400 members to over 2,000.  As Chair of the Finance Committee, Mike has also helped the Garden professionalize its business activities.

Mike has built three companies during his career which had 300, 500 and 1100 employees; two of the companies went national doing business in all 50 states, and the third was a Bay Area coffee chain of 30 drive thru locations (Caffino).  Mike also has extensive real estate experience, having developed housing subdivisions and investments in multi-family projects. Mike graduated from The University of Notre Dame with a degree in International Relations in 1970.

Nina Bancroft Dickerson

Nina is a graduate of Wellesley College. As a daughter of the garden founder, she grew up on what was once the Bancroft farm and has seen the Garden grow and develop from the beginning. As a community leader, she has served in official positions in many organizations including Monte Vista High School Keynoters, Camp Fire Boys and Girls, The PTA, and as President of The Equestrian Center of Walnut Creek. Her professional work has been in the area of Social Services. She is Vice-President of the Board and a member of the Garden’s Governance Committee.

Gretchen Bartzen

Former Executive Director since 2012. Fundraising professional with 22 years of experience, primarily for The Seven Hills School in Walnut Creek. Former secondary and junior college teacher of literature and public speaking for 20 years.

Susan Hewett Chapman

Susan is a long time resident of Danville, and very involved in the civic and cultural life of Danville, Walnut Creek, and the East Bay communities. She has been an active member of AAUW, and served 9 years as a trustee at Seven Hills School in Walnut Creek. She was chair of the Governance Committee there, and also helped with the Development Committee. She was also active with The Athenian School parent board. Susan is a graduate of Scripps College and the University of Minnesota. She is a former elementary school teacher and worked in business administration and human resources prior to raising her family. Susan has volunteered extensively in education and civic organizations since moving to the East Bay in the 1980s. She was elected to the Garden Board 2015.

Spencer Dress

Spencer grew up in Yuba City, CA and moved to Walnut Creek in 2012 where he attended Diablo Valley College and graduated from Saint Mary’s College of California with a degree in Political Science.

He now works with his Father in operating and managing personal storage facilities in Northern California. He was most taken by the beauty and variety of the drought-tolerant plants in the Garden and believes that civic engagement and education centered on drought tolerant practices will provide incredible benefits to the wellbeing of the environment and significantly increase the quality of life throughout the East Bay.

He is passionate about getting younger people involved in civic-minded activities and wants to help foster the next generation of leaders to ensure that our community remains one that we can all be proud to call home.

Carol Maerzke

Carol Maerzke and her husband John have been members of the Ruth Bancroft Garden since 2008, and Carol has served on the Board since 2011. She is an active member and past president of the San Francisco Garden Club, Glen Park Garden Club, and the St. Luke’s Hospital Auxiliary Board. Carol is also a sustaining member of the Junior League of San Francisco and the Fine Arts Museum Auxiliary. Some of her work experience includes teaching, public relations, marketing research, wholesale sales, and floral design. Now she considers herself to be a Professional Volunteer and finds pleasure in making a constructive contribution to the community. For Ruth Bancroft Garden she serves on the Governance committee, works on events, as well as helping to raise the Garden’s visibility in the local community and greater Bay Area. Carol enjoys traveling, gardening, floral design, photography, music, and activities at the Garden with John.

Gail Giffen

A mother of four, Gail has had a successful career in real estate investment and also owns two Bay Area pizza restaurants. Her hobbies are duplicate bridge and theatre; she is a big supporter of Playhouse West. Gail is an addictive sculpture collector and enjoys sharing this passion with her friends. She serves on the Finance Committee and the Committee for the Annual Sculpture in The Garden Show. Gail is in her second term on the Board.

Julie Rose

Julie Rose is a retired attorney living in San Ramon, having moved there from St. Paul, MN in 1980. She first visited the RBG in 1992 where she was immediately taken by cacti and succulents and has grown and collected them ever since. Julie was the president of the California Cactus and Succulent Society in Oakland for 5 years. She has been a member of and volunteer at the RBG since 2010.

Bernie Rose

Bernie Rose is likewise a retired attorney also living, as one might surmise, in San Ramon. He has been a Red Cross water safety instructor, the manager of a skeet/trap range, a tennis instructor and a research chemist. His interests, in addition to the RBG, include classical and folk music, art, brewing beer, wine tasting and learning to play the hammered dulcimer.

Earl C. Ruby III

Earl Ruby owned and ran a software consulting company in Walnut Creek for 9 years. He is currently a Staff Engineer at VMware, orchestrating cloud infrastructure and Kubernetes clusters for GPU-based ML/AI projects. He also lead an engineering team developing container orchestration systems at Apcera, built cloud storage reference architectures for Seagate, created web-based settlement, network quality of service and fraud-detection software for the wholesale telecom industry, and built wireless telemetry networks for electric, gas, and water utilities at Schlumberger. He earned a bachelor’s degree in Computer Science from Cal Poly, San Luis Obispo, with a concentration in Artificial Intelligence.

Earl has been coming to the garden with his wife Susan since 2003, and has been volunteering at the garden since 2014. He built and designed the garden lighting for the first annual Garden of d’Lights in 2019 and has volunteered at plant sales, taking plant inventory at the nursery, setup and teardown at the annual dinner, and working at the sculpture show. He is the current chair of the Garden of d’Lights committee.


Susan Ruby

Susan started volunteering at the age of 17 at Marin General Hospital.  She worked on weekends and summers at the hospital for four years, working on the hospital floors, pharmacy and in the dietary department. She also trained new volunteers.

Susan earned her bachelor’s degree in Dietetics from Cal Poly, San Luis Obispo and worked as a Nutritional Specialist for two years.  She made a change in careers, went to Diablo Valley College earning a Certificate in Engineering Drafting, then worked as a commercial architectural drafter for 15 years.  In 2010 Susan earned a Master’s in Business at John F. Kennedy University. In 2011 she became a NASM certified personal trainer.  She worked as a personal trainer for a year until her mother got sick with cancer and then came home to take care of her.

Susan has been working as a volunteer at Ruth Bancroft Garden for six years.  She has worked in the office, the kiosk, and at special events.  Currently she spends several days a week in the office filing papers, sending out mailings, and keeping the Volunteer Hour Database up to date.  Susan serves on two committees – the Annual Dinner and Garden of d’Lights. She went through the Docent Program so that she could learn more about the plants in the garden.  Susan and Earl host a sign up dinner party for eight each year at Stephen Lysaght’s house.

Susan’s passions are bodybuilding, fitness, cooking, collecting plants, and the Ruth Bancroft Garden.

Marco Vaticano

Marco is a passionate, tech-savvy real estate agent with Compass and proud San Diego State University alumnus. While he believes in the importance of technology in this new-age digital marketplace, he believes even stronger in building meaningful relationships with the very people that make this lifetime worthwhile. Marco is also an event planner for the Young Professionals Network and designs engaging events to connect, inspire and educate those within the real estate community. In his downtime he loves being in the garden, working out, and playing golf.

Mary Walker

Mary has worked in telecommunications for MCI for over 15 years. She and her husband now own Daily Graphics, a print service bureau which qualified as a Bay Area Certified Green business in 2005 and advocates the importance of using digital to print.

DDI was awarded Pleasant Hill Green Business for 2014, and recognized for “Sustainable Business Resource Management” in 2017 by Sustainable Contra Costa. Most recently the business was given the “Congressional Conservation Business Award” from the John Muir Society for 2018.

She is the founding member of the Pleasant Hill Green Committee, established in 2005, who recently convinced our city council to support and implement a city wide plastic bag ban. The committee’s mission is to advocate “green” business practices in the community.

In her spare time, Mary can be found gardening, planting vegetables, cooking, reading, and enjoying the outdoors.

Monique Young

Residential real estate broker in Walnut Creek since 1987. Long-time Tribunal Chair and mediator for Contra Costa Association of Realtor’s Professional Standards Committee. Diablo Valley College real estate instructor and mentor.