Leadership & Staff

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Medical Advisory Board
Board of Directors

Marilyn G. GellerMarilyn Grunzweig Geller, Chief Executive Officer

Marilyn is Chief Executive Officer for Celiac Disease Foundation (CDF), the nation’s leading voluntary health organization for celiac disease and gluten sensitivity. For 14 years, Marilyn’s son suffered with debilitating symptoms despite seeking help from innumerable health professionals. A chance blood draw revealed celiac disease was the cause of his suffering. From that day forward, Marilyn, a longtime healthcare executive, became active in celiac disease advocacy, joining the CDF National Board of Directors. In 2012, Marilyn succeeded Founder Elaine Monarch as Chief Executive Officer.

Marilyn has focused CDF on two important initiatives: FDA gluten-free labeling regulations and a national awareness campaign to increase the shockingly low rate of celiac disease diagnosis. A strong believer in the power of technology, she continues to develop online tools to empower patients to seek diagnosis and treatment of celiac disease. Under her guidance CDF joined the Community Engaged Network for All (CENA), a patient empowerment network of the Patient Centered Outcomes Institute (PCORI), and is one of the first organizations to participate in the American Autoimmune Related Diseases Association (AARDA) autoimmune research network. In 2014 she hosted the autoimmune disease roundtable at the Milken Institute Partnering for Cures conference. In 2015 served on the FDA GREAT3 Steering Committee and was named an inaugural winner of the Alpha Chi Omega Real. Strong. Women. of Distinction Award.

Because of her in-depth knowledge of the issues surrounding celiac disease, Marilyn has become a primary spokesperson on the gluten-free labeling issue. She has been featured nationally on the Hallmark Channel’s Home and Family Show, internationally on television networks in Europe and the Middle East, and in numerous newspapers and magazines, including USA Today, National Geographic and Gluten-Free Living.

Marilyn brings more than 20 years of management experience in healthcare and IT operations. A former Los Angeles County and UCLA hospital administrator and RAND Corporation researcher, she is a co-founder of Medversant Technologies, where she was responsible for the company’s strategic direction and is the lead inventor of the company’s patented technologies. Marilyn’s nonprofit experience includes board positions with the Olive View-UCLA Foundation, UCLA Health Services Alumni Association and Alpha Chi Omega.

Becoming CDF’s Chief Executive Officer marks a return to her roots in public health advocacy. Selected as a Los Angeles County Department of Health Services Fellow, Marilyn received her MSPH degree from the UCLA School of Public Health and her undergraduate degree from UCLA.

Email Marilyn at marilyn.geller@celiac.org

Deborah CeizlerDeborah J. Ceizler, Chief Development Officer

Deborah is Chief Development Officer for Celiac Disease Foundation (CDF), the nation’s leading voluntary health organization for celiac disease and gluten sensitivity. Deborah brings a diverse background in advertising, marketing and event planning to CDF. She previously served as CDF’s Director of Marketing.

Deborah provides senior leadership and strategic direction for CDF fund raising campaigns and special events. During her tenure as Director of Marketing at CDF, fundraising campaign revenues have increased by 600 percent through program expansion and business development. Deborah’s effective strategies and implementation have helped to raise the profile of the organization on a national level. In support of the CDF mission, Deborah has identified and cultivated relationships in the healthcare and lay communities, as well as food manufacturing and food service industries. She is responsible for the planning and management of CDF’s National Education Conference and Gluten-Free EXPO, which draws national attendance and features lectures from the nation’s leading medical experts in celiac disease in addition to a vast array of exhibitors.

Email Deborah at deborah.ceizler@celiac.org

Gillian Entin, Development Manager

Gillian Entin is the Development Manager at Celiac Disease Foundation. She is responsible for planning and implementing social media campaigns, special fundraising events and sponsor relationships. Gillian also manages Team Gluten-Free, CDF’s Peer to Peer community fundraising program and Celiac Disease Foundation U, CDF’s nationwide college chapter program. Gillian brings her experience in marketing, event planning and fundraising to her work at Celiac Disease Foundation. Celiac disease is a topic that Gillian is personally passionate about since being diagnosed 4 years ago. She is dedicated to CDF’s mission to increase awareness and advancement of research to end the needless suffering caused by celiac disease.

Gillian spent three years as the President of Arizona Public Interest Research Group, a non-profit through University of Arizona before moving back to California where she ultimately earned her Bachelors Degree from California State University, Northridge. A licensed EMT, Gillian is still very involved in the medical community, volunteering as emergency medical help for marathons and events in her spare time. Gillian is thrilled to be able to combine her professional experience with her dedication to celiac awareness to work with CDF to make a difference in the celiac community.

Email Gillian at gillian.entin@celiac.org


Talia HassidTalia Hassid, Community Coordinator

Talia Hassid is the Community Coordinator at Celiac Disease Foundation. She is responsible for overseeing all internal and external communication throughout the Foundation, including policies and procedures, handbooks, training guides, newsletters, annual reports, press releases, blog posts, and more. One of her key roles is implementing a communications strategy to support the Foundation’s programmatic and fundraising initiatives through media outreach, website management, social media, and publications. Talia also works with CDF Chapters and Support Groups to strengthen community-level support and involvement around the country.

Talia recently earned her Master’s in Public Health from Touro University, and is excited to pursue a career in the gluten-free and celiac world. Since her diagnosis in 2011, she has been an active member in the gluten-free community and has become a zealot for gluten-free living. Talia is passionate about helping others live happily gluten-free, and is thrilled to be involved with Celiac Disease Foundation to help advocate for celiac disease and increase public awareness for our cause.

Email Talia at talia.hassid@celiac.org  

425320_2917708616929_1766026566_nMatthew Clark, Project Manager

Matthew Clark is a Project Manager at Celiac Disease Foundation. He is responsible for overseeing the Gluten-Free Allergy-Free Marketplace and its mobile app. His key role is selling and promoting the Marketplace while offering project support to other CDF projects and programs.

Matthew has a background in business administration, creative writing, social media, I.T., and other business oriented skills and initiatives. He is passionate about helping others and connecting people with the gluten-free and allergy-free products they need.

Marianne BrooksMarianne Brooks, National Education Conference Volunteer Coordinator

Marianne Brooks is the Volunteer Coordinator for the CDF National Education Conference and Gluten-Free EXPO held each spring in Los Angeles, CA. Marianne was diagnosed with celiac disease in 2006 and has been involved in CDF activities since that time. She currently owns a small business in the South Bay, CA, and prior to this, spent 28 years in a Global Telecommunications company as the Director of Service Delivery. Marianne is very involved in her community, serving as an emergency room volunteer at a local medical center, and a volunteer at a Feed the Needy program. Marianne’s professional experience combined with her passion for celiac awareness and serving the community brought her to her role at CDF.

To be a National Education Conference Volunteer, email Marianne at info@celiac.org

Justin TsuiJustin Tsui, TeamLogic IT

Justin and his TeamLogic IT staff provide CDF with in-depth experience and insight in IT strategy development and management. Passionate about non-profits, TeamLogic IT brings clarity, simplicity and coherent IT strategy and solutions to CDF, lowering overall operational costs and optimizing operational efficiency.

Justin holds a Masters Degree in Electrical and Computer Engineering from the University of California, Irvine, specializing in distributed and fault tolerant computing.


TeamLogic IT is a nationwide network of computer consultation and managed services businesses providing outsourced IT services to thousands of businesses throughout the United States. The company addresses the needs of most computer networks and systems and strives to become the “IT Partner” for small and medium-sized business customers.