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Who We Are


Our Valued Staff

Donald R. Yance ~ Founder, President, Mederi Center Lead Clinician

Donald “Donnie” R. Yance is a Clinical Master Herbalist and Certified Nutritionist renowned for his extraordinary knowledge and deep understanding of the healing properties of plants and nutrition, as well as epigenetics, laboratory medicine, oncologic pathology, and molecular oncology. He is a professional member of the American Herbalists Guild and the National Association of Nutrition Professionals. He is also professed as a Secular Franciscan, which equips him with the breadth and wisdom to touch on the spiritual aspects of healing. Donnie conducts his clinical practice at the Mederi Center in Ashland, Oregon utilizing his unique integrative model known as the Eclectic Triphasic Medical System (ETMS) or “Mederi Medicine”, which he evolved over more than twenty years of successful patient care. The ETMS model elegantly combines his passion for the latest scientific research with the wisdom of ancient healing traditions, resulting in a compassionate, creative, intelligent, and effective approach to healing. As a visionary leader, mentor, teacher, author, and healer, Donnie’s methodology has transformed thousands of lives and is carried out through the mission and programs of the Mederi Foundation.

Jennifer Yance, Co-Founder ~ Executive Director

Jennifer Yance's work at the threshold of the organization has been a key element to its growth and accomplishments. With her impassioned determination and an aura of inspiration, she oversees and directs the fundraising, clinical, research, and education programs and gracefully guides the organization in serving its mission.

Jennifer’s business acumen, effective leadership, and deep commitment to healthy living contribute to her ability to help the organization reach its highest potential for serving humanity.


Susan Abookire ~ Director of Medical Education and Faculty Development

Susan Abookire, BSEE MD MPH FACP is an award-winning senior physician executive with over 20 years’ experience leading organizations in quality, patient safety, medical staff affairs, credentialing, and clinical excellence. She served as Interim Chief Medical Officer at University Hospital in New Jersey. She was Senior Vice President and System Chief Quality Officer of Houston Methodist. She was the first Chair of Quality and Patient Safety at Mount Auburn Hospital, a Harvard Teaching Hospital in Cambridge Massachusetts, where she founded and led the award-winning program in Quality and Patient Safety. 

A graduate of Harvard Medical School, Dr Abookire completed residency at Brigham and Women’s Hospital, and practiced Internal Medicine full time before devoting herself to leading patient safety and quality. Dr Abookire earned a Master’s in Public Health from the Harvard School of Public Health, focusing on Clinical Effectiveness. Dr Abookire teaches nationally and internationally on topics including health care technology, human factors, high reliability, systems analysis, effective learning systems, disclosure and apology, and applying lessons from aviation safety to healthcare. She completed a Harvard Fellowship in Medical Education and led as Curriculum Director for the Harvard Medical School Fellowship in Quality and Patient Safety. 


Dr. Susan Saccomanno, ND, LAc ~ Care Team Practitioner

Dr. Susan Saccomanno, ND, LAc holds a Doctorate in Naturopathic Medicine and a Master of Oriental Medicine both from the National College of Natural Medicine and Bachelor of Arts degrees from Syracuse University and Appalachian State University. Dr. Saccomanno has over twelve years of experience as a primary care physician in family practice and specializes in holistic cancer care and chronic illness.

Dr. Saccomanno’s approach combines cutting edge research and Naturopathic and Chinese traditions along with the ETMS (Eclectic Triphasic Medical System). She has deep faith in the healing and regenerative powers of natural therapeutics, which plays a central role in her treatment. Susan enhances mainstream therapies to minimize side effects and to prevent future occurrences.



Dr. Pamela Plank, ND, LAc ~ Care Team Practitioner

Dr. Pamela Plank received her bachelor’s degree at the University of Colorado-Boulder in Molecular Cellular Developmental Biology with a Biochemistry minor and earned her Naturopathic Doctorate (ND) and Masters of Oriental Medicine (MSOM) from the National University of Natural Medicine in Portland, Oregon. She is also licensed as an Emergency Medical Technician (EMT).

Dr. Plank combines cutting-edge knowledge from the Western allopathic medical world with the age-old wisdom of traditional medical systems. She uses both conventional blood diagnostic tests as well as Traditional Chinese Medicine diagnostics to get the most accurate diagnosis possible. Formally trained in the ETMS/Mederi Care approach to patient care, Dr. Plank has also maintained a clinical focus on complementary cancer care for the last five years and joined the Mederi Center in 2019.


Pauleen Miller ~ Chief Financial Officer

Pauleen serves as a key member of the Executive Leadership Team.  As a true business partner to the Executive Director, Pauleen plays a critical role in developing strategic initiatives and overseeing the operational and financial aspects of the organization.





Melissa Pedersen ~ Executive Assistant to Donnie and Jennifer Yance, Education Program Administrator

With a Masters in Educational Technology, Melissa is ideally suited for handling both of these tasks – especially with her background in business development, project management, project progress documentation and reporting, systems analysis, and the creation and development of classroom and computer-based training/support programs as well as the requisite foundational curriculum to implement them. 

Melissa is passionate about supporting the training programs that educate practitioners about all facets of the ETMS so that they can create personalized patient protocols, and increase their expertise in diagnostics and therapeutics. 



Andrea Luchese ~ Marketing Manager

In her role as Mederi’s Marketing Manager, Andrea is responsible for advancing the business development objectives of the Clinic and Foundation by overseeing and implementing marketing strategy, branding, communications, creative direction and design, social media, public relations, and event publicity. She brings a passion for supporting the Mederi mission of helping people live healthier, longer lives through sharing our story of inspiration and hope with patients, practitioners, and donors.

Andrea joined our team in 2019 from her prior fourteen-year tenure as senior member of the marketing team at our affiliate company, Natura Health Products. Andrea has a Master of Arts degree in Integral Dance with a focus on Dance & Spirituality and is the founder and president of an Ashland-based 501c3 Hawaiian cultural arts and preservation organization.


Amey Broeker ~ Practice Manager

As our Practice Manager, Amey approaches her work with the belief that a healing clinical environment requires sensitivity, gracious service, clear communication, confidentiality, collaboration, and flawless functionality at all times. Amey's diverse and impressive 25-plus years of management experience in manufacturing, retail, and distribution more than qualifies her to carry out that vision.      

With experience in developing policies, hiring, inventory management, merchandising, procurement, compliance and more, we've come to count on Amey as an observer, listener, communicator, and natural "problem-solver" to ensure the smooth running of the clinic for clients, patients, and staff alike.


Molly Bolin ~ Client Liaison

Molly joined the Mederi Center team in 2015 and is the Client liaison for Susan Saccomanno, ND, Lac. Molly brings over a decade of healthcare experience, providing direct patient care, as well as administrative support. She thoroughly enjoys her role at Mederi Center, as she values the Mederi model of empowering mind, body, and spirit. Providing exceptional client care is what motivates her each day. 

As Dr Susan's Client liaison, Molly is the liaison between the client/patient and practitioner and it is her job to tend to all the details of this continually evolving and complex relationship (including maintaining comprehensive documentation and filing as well as scheduling) in order to provide the continuity-of-care necessary for executing long-term treatment plans and associated lifestyle changes for optimal and successful outcomes.



Erin McKinsey ~ Client Liaison

Erin is the Client Liaison for Donnie Yance as well as one of our Herbalists. She is admirably suited for both roles with post-graduate degrees in Environmental Education and Biomedical Sciences. She also has a background as a scientist, laboratory supervisor, and instructor for herbalism and medicinal plant classes for a variety of organizations.  

It is her profound understanding of herbalism and medicinal plants that makes her so perfect for both jobs. She has conducted biological & chemical research of botanicals and natural products utilizing microscopy, HPLC, LC-MS GC-MS, and HPTLC techniques. She has also performed both quantitative analyses of botanical compounds and qualitative analyses for botanical identity confirmation.  

It's easy to see how Erin is the ideal person to also focus on the complex, ever-changing details of accurate documentation, scheduling, and interacting with clients, all prerequisites for successful client relationships and outcomes. 

Beverly Foster ~ Apothecary Herbalist Manager

Beverly is eminently qualified for her position given her background as a certified Ayurvedic Practitioner with clinical experience advising on Ayurvedic and Western herbal/botanical remedies, diet, nutrition, and more.  As the manager of our compounding apothecary, she is responsible for all aspects of Mederi’s apothecary operations such as: training and directing our apothecary staff, having knowledge of all apothecary products and procedures, custom mixing/labeling for individual clients and practitioners, ordering/receiving inventory, quality control and procurement, accurate record keeping, ensuring AHPA Good Compounding practices are followed, and fielding non-specific questions for walk-in clients and outside practitioners.



Gretchen Roberts ~  Customer Service / Order Fulfillment Coordinator

Gretchen has been with Mederi Center since 2004 and is intimately aware of the need for timely, accurate, rapid, actionable, and documented communication between practitioners and their clients/patients.  This is especially so when it comes to knowledgeably answering order fulfillment questions about products, following Apothecary Policies & Procedures, overseeing quality assurance checks on all product orders, and archiving and maintaining accurate and up-to-date practitioner/client account information.




Diane Chasmar ~ Clinic Receptionist/Administrative Assistant

Diane joined the Mederi Center team in 2019 and is the hub of our client/patient reception. With her friendly and gracious demeanor, Diane handles phone and email communications, schedules appointments for multiple practitioners and also serves as a product shipping coordinator. Diane plays a supportive role for many aspects of our organization, and strives to create a streamlined customer service experience. Diane's previous professional experience includes business management, and 25 years in the publishing industry including graphic design, and photography.




Gayle Vezie ~ Bookkeeper

Gayle Vezie has been working as the bookkeeper for Mederi since 2003. She takes pride in and truly enjoys the challenges of her day-to-day tasks including all aspects of accounts receivable and accounts payable for the Mederi Foundation and Mederi Center.




In Loving Memory of Zeny Yance 

Zeny Yance passed away January 26, 2016 at Rogue Regional Medical Center in Medford, OR at the age of 60. Zeny worked at the Mederi Centre for Natural Healing for more than 20 years, and was devoted to a life of service helping others. She was a great friend to many and always worked with a sense of pride and purpose. Zeny embodies the spirit that the Centre was founded on and her memory will live on with us forever.

© 2020 Mederi Foundation

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