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Dr. Catherine Johnson, M.D.

Dr. Catherine Johnson founded the practice of Precision Medical Care in 2018. She is an Obesity and Emergency Medicine Board Certified Physician and Menopause Society Certified Physician with over 25 years of clinical experience. After years on the front lines in emergency departments teaching medical students and residents, she realized her true calling: building deep, personalized relationships with her patients—learning not just about their symptoms, but their stories, lifestyles, goals, and challenges. 

A proud daughter of Greek immigrants, Dr. Johnson’s passion for health was shaped by the early loss of her father, a PhD chemist, and the vitality of her mother, a retired biochemist and published poet who loves to review medical research with her. This personal and professional background fuels her mission to help others prevent illness, optimize health, and age with strength, integrity and clarity. Upon her graduation from Loyola University Stritch School of Medicine in 2000, she completed her emergency medicine residency training and served as Chief Resident at the University of Chicago.  She has over eighteen years of experience in academic emergency medicine as Associate Professor of Medicine at the University of Chicago and Associate Professor of Surgery at Loyola University Chicago. 

Her pivot into longevity and precision medicine began with her personal struggles related to infertility, endometriosis, congenital hip dysplasia, overweight/obesity, prediabetes, insulin resistance, anxiety and perimenopause/menopause. These challenges led her to the research that uncovered life-changing insights about aging, inflammation, and metabolic health. Dr Johnson’s pursuit of healthy longevity is inspired by the work of Dr Eric Topol, Dr Peter Attia, Dr Eric Verdin, Dr Sara Gottfried, Dr Valter Longo, Dr Nir Barzilai, Dr Florence Comite, Dr Dale Bredesen and the countless contributors of science and longevity research.

Dr. Johnson has achieved advanced certifications from the Age Management Medicine Group and the Institute for Functional Medicine, complemented by advanced fellowship training in Precision Medicine and the Clinical Peptide Society.

At her core, Dr. Johnson is a problem-solver. Her expertise in emergency medicine gives her a decisive edge in quickly connecting the dots and managing complex conditions. She brings a unique, integrative approach to precision and longevity medicine. She specializes in hormone optimization, metabolic health, and evidence-informed lifestyle interventions, helping men and women optimize their healthspan with vitality and resilience.  Dr. Johnson is dedicated to guiding her patients toward renewed energy, purpose, and well-being, one precision-tailored plan at a time.

Dr Johnson is a person of great faith, purpose and love for community and family. Her work is most inspired by her commitment to her husband of over 25 years and their son and daughter who are now college students. She believes community, purpose, and curiosity are essential ingredients to longevity—and she’s here to help you match your wisdom and resilience with a body that is biologically adapted to optimal health.

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Dr. Deepti Agarwal, M.D.

Dr. Deepti Agarwal is a triple board-certified physician whose career spans perioperative medicine, advanced procedural care, and the science of healthy longevity. She trained at Northwestern University’s Feinberg School of Medicine and Weill Cornell Medical Center, and currently directs patient care at Precision Medical Care’s boutique Chicago practice, where she works with high-performance individuals seeking personalized, proactive care.

After years of caring for surgical and chronic pain patients, Dr. Agarwal began to recognize deeper, often overlooked contributors to illness, chronic inflammation, hormonal shifts, and metabolic dysfunction. This insight shaped her signature approach: merging traditional medical expertise with integrative, data-driven strategies to optimize healthspan.

Her work integrates biomarkers, genomics, hormone optimization, metabolic resilience, and regenerative therapies. She specializes in age management for both men and women, with a focus on key transitions like perimenopause and andropause. Her approach places particular emphasis on women’s health and the underrecognized impact of hormonal shifts on cognition and overall vitality.

As a longevity strategist, Dr. Agarwal advises individuals and organizations globally, translating cutting-edge science into actionable strategies for aging well. She continues to share her insights at international forums, including SXSW London and other thought leadership platforms.

Her mission is to catch health issues before they escalate, putting patients back in control of how they age and feel.

Certifications & Affiliations

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    “You are the greatest, thank you so much for saving me from doctors that just didn’t look deep enough!”

    – T.M.

  • Five black stars with the words "Star Ratings" written above them

    “I honestly feel ten years younger today than I did prior to meeting you, thank you!”

    – J.G.

  • Five-star rating graphic with five black stars

    “I am ever grateful for your expertise, guidance and help leading me to better health.”

    – R.H.

  • Five-star rating icon with five stars.

    “You are a brilliant mind and wonderful person. We are blessed to have met you.”

    – M.C.

OUR OFFICES

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    Clarendon Hills

    23 Walker Ave Clarendon Hills, IL 60514

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    Chicago

    215 N Peoria St. Chicago, IL 60607

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    Naples

    365 5th Avenue S #220 Naples, FL 34102