Investigators
Physicians who bring expertise, knowledge and passion
Our clinical investigators bring a wealth of knowledge and leadership to our organization.
With a full range of specialties and interests, they work actively and onsite with
our research teams to deliver the most reliable, comprehensive data available in
the industry.
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Rheumatology
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Jefrey D. Lieberman, MD
Specialty: Rheumatology
Board Certification: Rheumatology and Internal Medicine
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Dr. Lieberman graduated from Ohio State University School of Medicine and completed
his internship and residency at the Cleveland Clinical Foundation and fellowship
in Rheumatology & Immunology at Emory University.
He currently holds appointments as Chief of Medicine, Dekalb Medical Center Medical,
Consultant & National Spokesperson for Arthritis Foundation and Clinical Associate
Professor Emory University School of Medicine.
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Mohammed Abubaker, MD
Marietta Rheumatology Associates, PC.
Board Certified Rheumatologist
Rheumatology Fellowship: Emory University
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Dr. Abubaker completed his fellowship at Emory University School of Medicine in
2000. He was chief resident in Internal Medicine at Bridgeport Hospital. He is board
certified in Internal Medicine and Rheumatology. He has published and presented
several research papers in the American College of Rheumatology conferences. He
enjoys sports, traveling, and social services.
Clinic Location:
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Roel N. Querubin, MD
Marietta Rheumatology Associates, PC
Board Certified Rheumatologist
Rheumatology Fellowship: Emory University
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Dr. Querubin is a Board Certified Rheumatologist and completed his Rheumatology
fellowship at the Emory University School of Medicine. He graduated from the Georgia
Institute of Technology in 1991 with a Bachelor of Science degree and attended Medical
School at the Medical College of Georgia from 1991-1995. He then completed a three
year Internal Residency program at the Atlanta Medical Center in 1998. He has been
practicing Rheumatology in the Atlanta area since completing his Rheumatology Fellowship
in 2000. Dr. Querubin has published articles and research in several National Rheumatology
Journals and has presented at National Medical Meetings. His hobbies include music,
golf, martial arts and he enjoys spending time with his family.
Clinic Location:
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Maria N. Onuorah, ARNP
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Maria is a Nationally Certified Nurse Practioner. She has over 17 years of experience
in the areas of Rheumatology, Cardiology, Coronary Intensive Care, Elderly care
and Home Health. Maria received her Bachelor of Science in Nursing and Master of
Science in Nursing from Emory University. She lives in Atlanta with her husband
and children. She enjoys reading, speed walking, and traveling with her family.
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Pulmonology
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Thomas P. DeMarini, MD, FCCP, MBA, CPE
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Dr. DeMarini has a bachelor’s degree in Psycholinguistics from Illinois State University
, performed graduate work at the University of Illinois, and obtained his medical
degree from Northwestern University Medical School. He completed an Internal Medicine
Residency at Evanston Hospital at Northwestern University, where he was chosen as
Chief Medical Resident. He obtained his Pulmonary and Critical Care training at
Loyola University. Dr. DeMarini is Board Certified in Internal Medicine and Pulmonary
Disease.
Dr. DeMarini has given numerous lectures on the topics of Asthma, Chronic Obstructive
Lung Disease, Emphysema, Septic Shock, Ventilator Management, Pulmonary Embolism,
Deep Vein Thrombosis, and Sleep Apnea. He has served as a Primary Investigator on
multiple research studies and has been Chairman of the Pulmonary and Critical Care
Departments of several Metro Atlanta Hospitals. He is the past Chief of Staff at
DeKalb Medical Center and is the current Chief of Staff at Emory John’s Creek Hospital,
where he serves on the Board of Trustees.
Dr. DeMarini obtained his Masters of Business Administration, MBA, from Kennesaw
State University. He has also obtained a degree as a Certified Physician Executive,
CPE. He is an Independent Medical Consultant and a Medical Legal Consultant. He
has been recognized as an Atlanta Area Outstanding Pulmonary Physician in The Atlanta
Magazine survey. Dr. DeMarini is the founder of Southeastern Lung Care.
Dr. DeMarini sees patients in our Decatur and Johns Creek offices.
Clinic Location:
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C. Jonathan Wu, MD, FCCP
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Dr. Wu has a Bachelor’s Degree in Physics from Peking University and his Medical
Degree from Shanghai Medical University in China. He performed graduate work at
the Georgia Institute of Technology and completed his Internal Medicine Residency
training in NYU Downtown Hospital in New York. He finished his Pulmonary and Critical
Care Fellowship training at Emory University Hospitals in Atlanta.
Dr. Wu currently serves as the chief of staff for Decatur LTAC hospital and chairs
the Critical Care Committee at DeKalb Medical Center. He is board certified in Internal
Medicine, Pulmonary Medicine, Sleep Medicine and Critical Care Medicine. He is a
member of the American Thoracic Society, American College of Chest Physicians and
American Academy of Sleep Medicine. His interests include Sepsis, ARDS, COPD and
Sleep medicine.
Dr. Wu sees patients in our Decatur office.
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Internal Medicine
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Dharmaraj Patil, MD
- Specialty: Internal Medicine and Gastroenterology
- Board Certification: Internal Medicine
- Training: Graduated from Karnatak Medical College in Hubli, India
Dr.Patil graduated from Karnataka Medical College in Hubli, Karnataka, India in
1976 and completed his post graduate medical training in England where he obtained
the prestigious MRCP (UK) certification. ...more He trained as a Gastroenterologist
and worked as a Consultant Gastroenterology at King Fahad Hospital, AL Baha, Saudi
Arabia. Dr. Patil moved to US in 1994 and completed his Residency in Internal Medicine
from Memorial Medical Center, Worcester, Massachusetts. He has been in Atlanta area
since 1994 and started Metro Medical Associates in 1999. Dr. Patil has special interest
in Gastroenterology and manages most gastrointestinal diseases and performs in office
Gastroscopy and colonoscopy procedures for his patients.
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CSI Research, Inc. Staff
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Nancy Green, RN, BS
Research Director
Nancy is the founder and president and of CSI Research, Inc. Nancy is a graduate
of State University of New York (SUNY) with degrees in Health Science/ Biology and
Nursing. Nancy brings over 25 years of healthcare experience to CSI with 18 years
of experience in clinical research. Nancy is actively involved in business development,
patient recruitment and quality assurance. Nancy has conducted clinical trials in
oncology, cardiology, internal medicine, pulmonology, chronic pain management and
rheumatology. Raised in New York, Nancy resides in Alpharetta, GA.
ngreen@csi-research.com
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Betsy Hillhouse, RN
Lead Research Coordinator
Betsy is a licensed Registered Nurse and has over 20 years of experience in healthcare.
Her background includes the emergency room, medical/surgical, Internal Medicine,
Pediatrics, and Rheumatology. Betsy joins us at CSI Research as the Lead Research
Coordinator after serving for 15 years at Kaiser Permanente. Betsy has conducted
clinical trials in Rheumatology, Lupus, Gout, COPD, and OIC. Betsy was raised in
Canton Georgia and now resides in Cumming, GA.
bhillhouse@csi-research.com
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Suzi DeFiesta
Research Administrator
Along with an Associates Degree in business, Suzi brings over 20 years of experience
in Executive Administration to our team. After her years of service with the York
Division of Borg Warner and as Assistant to the President and C.E.O. of a Chicago
based money center bank, Suzi relocated to Atlanta with her husband and two children.
Suzi enjoys running, traveling and spending time with her family and the color pink.
sdefiesta@csi-research.com
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Legal Counsel
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Richard Bryson
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Richard S. Bryson is an attorney and Member Manager of Morris & Bryson, LLC and
a proud Eagle Scout (“once an Eagle always an Eagle”). His practice is limited to
trusts and business entities, estates, asset protection, incapacity planning and
tax planning [including retirement asset strategies].
Richard is a contributing author to many legal, tax and financial publications.
In addition he has provided lectures and presentations to hundreds of organizations
and forums on estate planning, asset protection, retirement asset planning, and
elder law issues.
He is a member of the National Academy of Elder Law Attorneys, State Bar of Georgia
Fiduciary Section, Gwinnett County Bar Association’s Estate Planning and Probate
Section, former co-chair of the Tax Section of the Chicago Bar Association, and
former co-chair of the Elder Law Committee of the State Bar of Georgia.
Office
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