Our clinician and care team is specially trained in functional medicine and limit the number of patients they see, so you’ll have more time at each visit to truly be heard.
Whether you need support for chronic issues, help getting to the root cause of symptoms, or care for acute needs, your functional medicine provider is here to guide your health journey with personalized, whole-person care.
Dr. DeHaan is a board-certified family medicine physician specializing in integrative and functional medicine.
Dr. DeHaan earned her medical degree from Boston University School of Medicine and completed her Family Medicine residency at Naval Hospital Camp Pendleton.
During her service as an active-duty physician in the United States Navy, she saw firsthand how nutrition, sleep, movement, and stress management influence health and well-being. She later completed a fellowship in Integrative Medicine at George Washington University, furthering her expertise in lifestyle and functional medicine.
Those experiences strengthened her passion for integrative and functional medicine and continue to shape her approach to caring for patients. Her clinical interests include mental health, women’s health, including preconception and perimenopause, and adolescent health.
Inspired by her mother, a medical professional during World War II, Dr. Stivi’s passion for medicine ignited at the age of six, when she accompanied her mother on hospital rounds. This early exposure instilled in her a lifelong commitment to alleviating suffering and providing compassionate care.
Recognizing the limitations of conventional pharmaceuticals, Dr. Stivi has embraced lifestyle, functional, and integrative medicine, focusing on prevention and identifying root causes of disease. Her holistic, systems-based approach emphasizes a thorough understanding of human physiology and biochemistry. In her practice, she fosters a supportive environment, listening attentively to her patients and considering every detail to ensure accurate diagnoses and personalized treatment plans.
Outside of her medical practice, Dr. Stivi enjoys ballroom dancing, playing classical piano, and exploring diverse gourmet cuisines during her travels. She values quality time spent with family, enriching her life with cultural experiences and culinary adventures.
Dr. DeHaan incorporates lifestyle and root-cause principles to support her patients across several key areas:
Mental Health: Supporting emotional and cognitive well-being through integrative strategies.
Women’s Health: Specializing in key hormonal transitions, including preconception care and perimenopause.
Adolescent Health: Guiding young adults toward sustainable, lifelong wellness habits.
From an early age, she knew she wanted to become a physician, but watching her older sister struggle with a chronic illness of unknown cause truly solidified her calling. That experience inspired her to practice medicine differently by listening deeply, understanding the whole person, and helping patients uncover the root causes of their health concerns.
She believes every patient deserves to feel seen, heard, and understood. She takes time to learn each person’s story and goals before creating an individualized plan that supports lasting health and wellness through a collaborative, patient-centered approach.
Outside of the office, Dr. DeHaan enjoys hot yoga, beach volleyball, gardening, cooking with seasonal ingredients, painting, writing, dancing, and spending time with her goldendoodle.
Ready to take charge of your health and partner with the Hoag Functional Medicine Team?
Dr. Svetlana Stivi is a board-certified physician specializing in family medicine, bringing over 20 years of clinical experience to her practice. She earned her medical degree from the UCI School of Medicine and completed her residency in family medicine at Long Beach Memorial Hospital. Dr. Stivi has enhanced her expertise with advanced training in functional medicine through the Institute for Functional Medicine.
Inspired by her mother, a medical professional during World War II, Dr. Stivi’s passion for medicine ignited at the age of six, when she accompanied her mother on hospital rounds. This early exposure instilled in her a lifelong commitment to alleviating suffering and providing compassionate care.
Recognizing the limitations of conventional pharmaceuticals, Dr. Stivi has embraced lifestyle, functional, and integrative medicine, focusing on prevention and identifying root causes of disease. Her holistic, systems-based approach emphasizes a thorough understanding of human physiology and biochemistry. In her practice, she fosters a supportive environment, listening attentively to her patients and considering every detail to ensure accurate diagnoses and personalized treatment plans.
Outside of her medical practice, Dr. Stivi enjoys ballroom dancing, playing classical piano, and exploring diverse gourmet cuisines during her travels. She values quality time spent with family, enriching her life with cultural experiences and culinary adventures.
Dr. Stivi is available for virtual care appointments for patients in the following states:
Ready to take charge of your health and partner with the Hoag Functional Medicine Team?