Meet The Team

Dr. Benjamin Fergus, DC, DNS

  • Graduate of National University of Health Sciences
  • Founder and Clinic Director of Cornerstone Health
  • Specializes in evaluation and treatment of chronic and complex presentations, biomechanics, and sports medicine.
  • Founder and Head Instructor of GRIP Approach (Global Rehabilitation & Injury Prevention)
  • International medical educator on examination, rehabilitation, manual therapy and sports performance.
  • First Illinois physician to be named a Certified Dynamic Neuromuscular Stabilization (DNS) Practitioner after completion of an intensive rotation at Motol Hospital in Prague, Czech Republic.
  • Sports medicine consultant to collegiate, professional, and Olympic teams

I founded Cornerstone Health to offer the highest quality healthcare to patients who have struggled with other options. I am dedicated to helping you achieve your health goals. 

– Dr. Benjamin Fergus

Denny Wongosari, MS, ATC, LMT

  • Licensed athletic trainer
  • Bachelor of Science in Athletic Training from Indiana Wesleyan University
    Post-professional Master of Science in Athletic Training from Indiana State University
    Licensed massage therapist
  • Specializes in injury prevention, sports rehabilitation & performance, vestibulo-ocular rehabilitation, and soft-tissue therapy
  • Has provided comprehensive sports medicine services in various colleges ranging from NCAA division 1 to NAIA in Colorado, Indiana, Wisconsin and Illinois.

“I work as part of the rehabilitation team at Cornerstone Health and help patients graduate from initial care to strengthening and self-care. I develop fitness and injury prevention programs based on modern science to keep our patients healthy.”

– Denny

Brett Douglas Boddicker DAT, LAT, ATC

  • Licensed Athletic Trainer 
  • Graduated with B.A in Athletic Training from Central College in Pella, Iowa in May 2017 
  • Graduated with Doctorate in Athletic Training (DAT) from Indiana State University in May 2019
  • Experience in providing comprehensive sports medicine services to large IHSAA school district in Indiana. 
  • Certified in Graston Technique (M-1) 
  • Extensive education in advanced Manual Therapy techniques (Maitland, Mulligan, ART, PRT, etc.)
  • Experience in content analysis of Standardized Patient Education 
  • Publication under review in the Athletic Training Education Journal (ATEJ) 
  • Presented research at 70th Annual National Athletic Trainers Association Clinical Symposia in June 2019

“I work as a part of the heathcare team at Cornerstone Health to empower patient to live their ideal lifestyle. Patients are people first, and at Cornerstone Health I collaborate with my colleagues to deliver high-quality, compassionate care to every patient we work with. I am motivated to help others achieve their goals through patient care”

– Brett 

Dr. Barbie Allegretti DC, CFMP

  • Expert in holistic and integrative health
  • Chiropractic Physician

“Functional medicine is a patient centered and health oriented approach. With functional medicine we look at the underlying causes of disease rather than diagnosing based on symptoms. The underlying cause of disease, particularly with chronic pain, differs from person to person. Therefore it is critical to consider biochemical individuality through testing in combination with getting to know the patient and learn of their complete history to support resolution of pain from the source.”

– Dr. Allegretti


Monday – 7AM–5:30PM
Tuesday – 7AM–7PM
Wednesday – 7AM–5:30PM
Thursday – 7AM–5PM
Friday – 7AM–3PM
Saturday – By Appt. Only
Sunday – Closed


1030 Davis St. Suite 100
Evanston, IL 60201
(Intersection of Davis & Oak)

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