Meet the Concierge Doctors and Specialists at Dedication Health
Finding a concierge physician who has the time to understand your health history, priorities, and long-term goals can change the way you experience care. Dedication Health brings together 10 concierge doctors and an experienced concierge nutritionist at its Winnetka and Northfield offices, providing personalized primary care, internal medicine, cardiology, gastroenterology, and nutrition support for adults on Chicago’s North Shore. Its membership model is designed around direct physician access, same-day appointment availability, longer visits, and care that feels more personal and coordinated.
Concierge Primary Care Doctors and Internists
John E. Croghan, MD
“I started Dedication Health to offer innovative, personalized primary care medical service and convenience to my patients. The high-volume and impersonal nature of today’s medical system simply does not offer what each patient fully deserves.”
Dr. John E. Croghan is the founder of Dedication Health and is triple board-certified in Internal Medicine, Rheumatology, and Geriatric Medicine. He earned his medical degree at Rush Medical College, completed his Internal Medicine residency at Loyola University Medical Center, and pursued fellowship training in Geriatric Medicine at Johns Hopkins University School of Medicine and Rheumatology at George Washington University Medical Center. His broad expertise supports personalized primary care that considers prevention, chronic conditions, rheumatologic needs, and healthy aging together.
Philip H. Sheridan Jr., MD
“It is very gratifying seeing patients understand and appreciate the care we provide for them. Often we are told in their prior encounters with the “healthcare system” they felt like their issues did not matter in a personal way to the teams taking care of them. In our practice, they feel cared for like each one of them individually matters to us on a personal level, and of course this is the case. We truly try to care for our patients the way we expect our own family members to be taken care of, and make them feel cared for like a family member.”
Dr. Philip H. Sheridan Jr. earned his medical degree from Loyola University Stritch School of Medicine, where he also completed his residency in Internal Medicine. After an internship at Rush Presbyterian St. Luke’s Medical Center, he returned to Loyola for fellowship training in pulmonary and respiratory disease. Dr. Sheridan is board-certified in Internal Medicine, Pulmonary Disease, and Critical Care Medicine, giving patients access to a primary care physician with valuable experience in respiratory health and the management of complex illness.
Richard D. Stern, MD
“I believe that it is vital to establish and preserve a trusting physician-patient relationship. Our concierge model enhances my ability to utilize both the art and science of medicine in the most personalized and complete fashion.”
Dr. Richard D. Stern is a board-certified internal medicine physician with extensive experience in private practice. He earned his bachelor’s degree from Washington University in St. Louis and his medical degree from Wright State University. He completed his Internal Medicine residency at Evanston/Glenbrook Hospitals, where he served as Chief Medical Resident, and is a senior attending physician within the NorthShore University Health System. Through concierge medicine, Dr. Stern is able to offer the accessibility, responsiveness, and time needed to answer patients’ questions, understand their individual health goals, and provide highly personalized care.
Santiago A. Candocia, MD, FACP
“Joining Dedication Health has allowed me to care for patients in the way that was traditionally practiced: one patient at a time with a focus on the whole patient over the course of their lifetime.In the past, I’ve tried to deliver concierge care to all my patients, but it was impossible to care for so many people and deliver truly personalized care – no matter how many hours per day I tried.”
Dr. Santiago A. Candocia earned a bachelor’s degree in Biological Sciences from Northwestern University and his medical degree from the University of Illinois College of Medicine. He completed his Internal Medicine residency at Northwestern University Medical School, served as Chief Resident in Medicine at Evanston Hospital, and held Clinical Instructor roles at Northwestern and the University of Chicago. Dr. Candocia is board-certified in Internal Medicine and also provides expertise in pre-travel consultations, immunizations, and travel safety.
Anat A. Lansky, MD
“Dedication Health shares the ideas that reflect my core values in providing patient-focused healthcare. Our commitment to personal service, comprehensive acute and preventative medicine, timely access, engaged advocacy, and knowing we genuinely care about each of our patients sets us apart and enables me to practice at a level of professional excellence that makes me feel proud.”
Dr. Anat A. Lansky earned bachelor’s degrees in Chemistry and Psychology from Indiana University before receiving her medical degree from St. George’s University School of Medicine. She completed her Internal Medicine residency at Advocate Illinois Masonic Medical Center in Chicago. Board-certified in Internal Medicine and specializing in Women’s Health, Dr. Lansky values accessible communication, individualized care plans, and the opportunity to build meaningful, long-term relationships with her patients.
Jana Mechurova, MD
“At Dedication Health, I bring a unique approach to patient care. I prioritize the quality of care, ensuring timely access and comprehensive services tailored to each patient’s needs. Our friendly, upbeat, and attentive staff works to enhance patients’ experience and takes it to the next level. Our practice provides the type of clinical care that most reflects the quality of attention I would like to give and receive.”
Dr. Jana Mechurova received her medical degree from Komenskeho University in Bratislava, Slovakia, and completed her residency at John H. Stroger Hospital in Chicago. She previously served as an Assistant Program Director at Mt. Sinai Hospital, where she taught and supervised residents while providing primary care to underserved patient populations. Dr. Mechurova is board-certified by the American Board of Internal Medicine and is fluent in English, Slovak, and Czech, with basic Spanish proficiency.
Concierge Cardiologists
Jason Robin, MD, FACC
“My goal has always been to deliver the newest, most cutting edge therapies while having the patient-doctor relationships of old. For me, every patient is family.”
Dr. Jason Robin is a board-certified cardiologist with expertise in Cardiology, Nuclear Cardiology, Echocardiography, Cardio-oncology, and Internal Medicine. He graduated with highest honors from Rush Medical College before completing his Internal Medicine residency, serving as Chief Medical Resident, and completing his Cardiology fellowship at Northwestern University. Dr. Robin has particular expertise in cardio-oncology and sports cardiology and currently serves as Director of Cardiology-Oncology at City of Hope. At Dedication Health, he provides comprehensive cardiovascular care ranging from prevention and early detection to the diagnosis and management of complex heart disease, with an emphasis on timely access, advanced diagnostics, and highly personalized care.
Michael J Waligora, MD, FACC
“Medicine is a blend of art and science. While I am fascinated by the science, which is constantly changing, it is the art of the relationships I value more, as they are the foundation of healing and wellness.”
Dr. Michael J Waligora is a board-certified cardiologist with more than 30 years of experience in cardiovascular medicine. He earned his medical degree from Saint Louis University School of Medicine, completed his Internal Medicine residency at Northwestern University, and remained there for his general Cardiology fellowship. His expertise includes preventive and sports cardiology, advanced diagnostics, coronary artery disease, heart failure, hypertension, and complex heart rhythm disorders. His approach centers on thorough evaluation, strong patient relationships, and individualized support for long-term heart health.
Concierge Gastroenterologists
Yolandra Johnson, MD
“What brings me the greatest satisfaction is the opportunity to truly connect with patients and make a meaningful difference in their quality of life. Many gastrointestinal issues can be chronic, frustrating, or difficult to talk about and I value being able to provide reassurance, answers, and personalized care. Seeing patients feel better, regain confidence in their health and knowing they have a physician who is accessible and invested in their well-being is incredibly rewarding.”
Dr. Yolandra Johnson is a board-certified gastroenterologist who brings decades of private-practice experience caring for patients on Chicago’s North Shore. She completed her internship and residency at Yale-New Haven Hospital, followed by a Gastroenterology fellowship at the University of Chicago. She also serves as a Senior Clinician Educator at the University of Chicago’s Pritzker School of Medicine. At Dedication Health, Dr. Johnson emphasizes timely evaluation, thoughtful communication, and highly individualized care for preventive screenings, new digestive concerns, and ongoing gastrointestinal conditions.
Jonathan Williams, DO
“My approach to patient care, combined with my professional experience, allows me to better understand what patients are feeling and identify their greatest concerns. I take the time to listen carefully, understand the full picture of their symptoms and experiences, and use that insight to help dissect the underlying issues contributing to their condition.”
Dr. Jonathan Williams is board-certified in Gastroenterology and completed fellowship training in Gastroenterology, Hepatology, and Nutrition at Loyola University Medical Center. A Clinical Assistant Professor at the University of Chicago’s Pritzker School of Medicine and a multiple-time teaching award recipient, he combines clinical experience with a strong commitment to patient education. His concierge approach gives patients time to explain their symptoms fully, understand their options, and take an active role in decisions about their digestive health.
Concierge Nutritionist
Karen Raden, MS, RD, CCN
“I am particularly passionate about helping patients understand how nutrition can support both how they feel today and how they age over time. My goal is to help each patient better understand their body, feel confident in their nutrition choices, and develop realistic strategies that support both current health and long-term well-being.”
Karen Raden is a Registered Dietitian and Certified Clinical Nutritionist with more than 25 years of experience. She provides personalized nutrition guidance for patients with a range of goals and concerns, with particular expertise in digestive health and complex medical or nutritional histories. When appropriate, she may incorporate advanced laboratory and functional testing to better understand digestive function, nutrient status, inflammation, and other factors that can inform a practical, individualized nutrition plan.
Learn More About Dedication Health
Dedication Health is a full-service concierge medical practice serving adults from its Winnetka and Northfield locations. By maintaining limited patient panels, the practice can provide direct physician access, longer appointments, timely evaluations, and closer coordination across primary care, cardiology, gastroenterology, and concierge nutrition. To learn more about a particular physician or specialist, request pricing information, or apply for membership, complete the Dedication Health contact form or call 847-986-6770.