Meet the Whole Health team
Bringing expertise, compassion and a shared vision for better health.
The HonorHealth Whole Health Institute is guided by a multidisciplinary team of clinicians, researchers and educators committed to transforming the future of healthcare.
Together, they’re redefining what it means to live well by blending scientific excellence with compassion, collaboration and innovation to support your health from every angle.
Leadership team
Shad Marvasti, MD, MPH, DipABFM, DipABLM
Executive Director
Dr. Shad is a nationally recognized leader in integrative health, culinary medicine, and lifestyle medicine who is actively engaged in creating solutions to promote health and longevity. He is a Stanford-trained physician who has over two decades of experience empowering patients and communities to take charge of their health. Acting to transform and redesign medical education, he has served on the faculty at Stanford University and at The University of Arizona (UofA) to train future physicians with the tools they need to prevent and reverse chronic disease by addressing its root causes. At the UofA, he founded the Culinary Medicine Program and his team created a nationally recognized open-access textbook of Culinary Medicine.
As a practicing physician, Dr. Shad provides lifestyle and food prescriptions for his patients to extend their healthspan. He currently serves as the founding Executive Director of Whole Health and the Whole Health Institute at HonorHealth in Scottsdale, Arizona where he is creating innovative clinical models including a longevity program to shift us from “sick” care to health care. Dr. Shad now also serves as Associate Professor of Clinical Practice at the John Shufeldt School of Medicine and Medical Engineering at Arizona State University. Dr. Shad has been featured in national media as a trusted voice on practical, science-based wellness.
Preston Allred
Vice President and Hospital Administrator
Preston Allred has more than 10 years of leadership experience at HonorHealth, where he began as an Administrative Fellow and has held various positions throughout the organization. He currently serves as Vice President and Hospital Administrator, leading the newly acquired Four Peaks and Florence Medical Centers and overseeing key joint‑venture partnerships across the system.
Preston has played a central role in major system initiatives, including leading the development of Sonoran Crossing Medical Center and multiple multimillion‑dollar strategic projects that expanded access and strengthened organizational capabilities. He is also leading the development of HonorHealth’s Health and Wellness Service Line, including its first medical fitness facility focused on advancing “movement as medicine.”
Dr. Allred holds degrees from the University of Arizona and the University of Pittsburgh, as well as a Doctorate in Organizational Leadership and Evidence‑Based Decision Making from Grand Canyon University. He is a Fellow of the American College of Healthcare Executives (FACHE).
Lindsay Bencic
Senior Director of Health and Wellness Operations
Lindsay brings over 24 years of wellness leadership, driving innovative programs and initiatives at HonorHealth. She is recognized for her strategic vision, operational excellence and dedication to enhancing patient and member experiences.
Holding bachelor’s and master’s degrees in communication, Lindsay leads with clarity and builds strong connections across teams and communities.
Outside of HonorHealth, she is a certified cycle and group fitness instructor, inspiring others to embrace movement and strength. Lindsay’s passion for wellness continues to leave a lasting impact on the lives of those she serves.
Manthan Thaker
Director of Medical Fitness
Manthan brings over a decade of experience connecting clinical care with wellness, designing evidence-based programs that support lifelong health.
He holds a bachelor’s degree in exercise physiology, a master’s in sports management, and certifications as an exercise physiologist (American College of Sports Medicine) and medical fitness facility director (Medical Fitness Association).
Grounded in the medical fitness model and the exercise-is-medicine approach, Manthan focuses on disease prevention, rehabilitation, and wellness through movement, nutrition and education.
Shalini Singh-Karnik, MD
Family and Integrative Medicine
Program Director, Integrative Medicine Resident Elective
Director, Whole Health Group Medical Visits/Shared Medical Appointments
Dr. Singh-Karnik specializes in whole-body health, integrating clinical hypnosis, mindfulness, acupuncture, and lifestyle medicine to empower patients on their health journeys.
At HonorHealth Integrative Medicine Clinic, she developed group medical visits, food-as-medicine programs, and the Produce Prescription Program, while launching physician-led wellness walks to promote community health.
Dr. Singh-Karnik serves as Assistant Professor of Clinical Medicine at Arizona State University’s John Shufeldt School of Medicine and Medical Engineering, principal investigator on a system-wide produce prescription grant, and holds leadership roles that promote culturally respectful, equitable integrative care.
Suzanne Bartlett Hackenmiller, MD, FACOG, ABOIM, dipABLM, MSCP
OB/GYN | Integrative and Lifestyle Medicine
Dr. Suzanne Bartlett Hackenmiller is board-certified in OB/GYN, Integrative Medicine and Lifestyle Medicine. Her personal, family and professional experiences motivated her to explore integrative approaches to healing and wellness. As a result, she completed a fellowship with the Andrew Weil Center for Integrative Medicine, as well as certifications in herbal medicine, Ayurveda, and meditation. She is certified as a nature and forest therapy guide and as a Menopause Society Certified Practitioner.
She is an award-winning author and she is also the founder and creator of a program providing parks and trail systems with mental and physical health prescriptions for their users. She speaks internationally about integrative medicine, women’s health, and nature therapy.
Joby Mathews, MD
Integrative Medicine Physician | Emergency Medicine Physician
Dr. Joby Mathews has practiced emergency medicine since 2008, following his graduation from the University of Connecticut School of Medicine. After more than a decade on the front lines, he witnessed firsthand the profound and often preventable impact of chronic disease—an experience that ultimately drew him to the field of Integrative Medicine.
He completed his fellowship through the Academy of Integrative Health and Medicine (AIHM) in 2023, where he deepened his commitment to whole-person, evidence guided care. Dr. Mathews believes that he and his patients are true partners in the healing process and works to ensure that every patient feels informed, supported, and empowered in their health journey.
His clinical interests include cardiometabolic health and longevity, with a focus on helping patients prevent disease, optimize well-being, and live with vitality at every stage of life.
Originally from Texas, Dr. Mathews has lived in Arizona since 2015. Outside of medicine, he stays active with daily workouts, enjoys watching his favorite Dallas based sports teams and exploring new cultures through travel with his family.
Victoria Cupic, MD
Family Medicine Physician
Victoria Cupic, MD, is a board-certified family medicine physician specializing in lifestyle medicine, preventive care and hormone replacement therapy. She offers specialized treatments including pellet insertion for hormone replacement therapy, weight lossmanagement and minor procedures such as suture placement and removal. Her clinical interests include hormone optimization for male and female patients, lifestyle modification and the strategic use of supplements to support whole-body health.
Dr. Cupic takes a preventive, root-cause approach to patient care, prioritizing shifts in diet, daily habits and targeted supplementation before turning to medications or further interventions. She sees patients through the HonorHealth Lifestyle Medicine Primary Care program, an optional membership-based model that complements medical care with wellness coaching, education and personalized support.
Her practice emphasizes partnering with each patient to build sustainable lifestyle changes that help prevent and manage chronic disease.
Originally from Novi Sad, Serbia, Dr. Cupic is fluent in Serbian, Croatian and Bosnian in addition to English. She enjoys yoga, hiking, running and strength training, and is an avid traveler who loves exploring new countries, bringing a well-rounded perspective to her medical practice.
