Board of Directors

Dr. Marcel Junqueira, M.D.

Marcel Junqueira, M.D. attended medical school in Brazil, his native country. He earned his medical degree at Valenca Medical School in Rio de Janeiro. Afterwards, he relocated to New York City for his residency in Internal Medicine. He continued his post graduate training at Kansas University, where he specialized in Pulmonary and Critical Care Medicine and at Temple University, where he finished Sleep Medicine fellowship training.
Dr. Junqueira is ABIM Board Certified in 4 different specialties, including Internal Medicine, Pulmonary Diseases, Critical Care Medicine, and Sleep Medicine. His special interests include Sleep Medicine, Respiratory Physiology, Interstitial Lung Disease, Lung Cancer, and diagnostic work-up for lung nodules.

Dr. Kathleen Brown, M.D.

Kathleen Hayes Brown, M.D., attended medical school in Chicago, Illinois. She earned her medical degree at Rush University. Dr. Brown completed her residency in Internal Medicine. She continued her post graduate training at Rush University, where she specialized in Cardiology and Electrophysiology.  
Dr. Brown is Board Certified in Internal Medicine, Internal Medicine Cardiovascular disease and Internal Medicine Clinical Cardiac Electrophysiology.

Dr. Robert Tonsing, M.D.

Dr. Bob Tonsing is Board Certified as a Psychiatrist with additional Board Certification in the subspecialty of Child and Adolescent Psychiatry.

After completing his training in 1989, he moved to Pueblo where he worked at the Colorado Mental Health Institute Pueblo on the child and adolescent wards as the faculty liaison representative for the University of Colorado Health Sciences Center.  Since 1992, he has engaged in full time private practice.  

In addition to his private practice, he is the Medical Director for Parkview Hospital’s Child and Adolescent Psychiatry Inpatient Unit, serves on the Graduate Medical Education Committee for the Family Practice Residency Program at St. Mary Corwin Hospital, and helps proctor that Family Practice Residency’s Psychiatric Clinic.  
In 1986, he married Sara Tonsing, an OB/GYN physician in Pueblo. They have three wonderful adult-aged sons.

Dr. Thomas Greidanus, M.D.
Past President
Dr. Greidanus is an established Emergency Medicine physician in Pueblo, Colorado. He is board certified with extensive management experience in the military and private sector. He obtained his master’s degree in health care management and is recognized by Beta Gamma Sigma for academic excellence in business school.
Currently the Medical Director at Parkview Medical Center (Pueblo, CO) and freestanding Emergency Room Parkview Emergency Services Pueblo West, Dr. Greidanus previously served as the Chief of Staff at Parkview Medical Center.

Dr. Brad Roberts, M.D.
Board Member & CMS Board Representative

Dr. Roberts was born and raised in Pueblo, Colorado. He graduated in the top 10 from South High School. He received his Bachelor of Science degree in Exercise Science Cum Laude from Brigham Young University and obtained his medical degree from the Medical College of Wisconsin. His residency was completed at the University of New Mexico, Department of Emergency Medicine, where he served as one of the Chief Residents.
Dr. Roberts is a passionate community volunteer and currently serves as Assistant Professor of Emergency Medicine at the University of New Mexico, and on the Board of Directors for the Colorado Medical Society, representing the Pueblo County Medical Society.

Dr. Cheryl Walker, D.O.
Board Member

Dr. Walker completed residency at Case Western, MetroHealth Hospital and is board certified in Anesthesiology. She has been practicing since 2009 at St. Mary-Corwin Medical Center.  

Dr. Walker received the Physician of the Year, “Golden Stethoscope Award” in 2016. She has served as the chairperson of the OR Steering Committee since it was formed in 2016. She has also served as an Associate Professor at Rocky Vista University. 

Dr. Walker is passionate about serving the Pueblo community and enjoys spending her free time in the mountains.

Dr. Kevin Weber, M.D.
Board Member

Dr. Weber is the medical director for most EMS agencies in southeastern Colorado along with being the Regional Medical Director for both Southeast Colorado RETAC and Southern Colorado RETAC. He has been an ED physician for about 30 years, and is board certified in EMS. He was the ED director at St Mary-Corwin Emergency Department. 

Dr. Weber recently resigned that position and took over as medical director of the ED at Spanish Peaks Regional Health Center. He loves EMS, plans to continue with EMS activity, and is very involved at the state level.

Dr. Ross Patrick, M.D.
Board Member

Bio coming soon.

Dr. Jacob Mathew, Jr., D.O.
Board Member

Bio coming soon.

Dr. Teresa Braden, D.O.
Board Member At-Large

Teresa Braden is a dedicated and highly-skilled specialist, serving the Pueblo community for 16 years in Emergency Medicine and Internal Medicine. She is actively involved in training residents with the skills needed to provide quality patient care as the Medical Education Residency Program Director - Internal Medicine at Parkview Medical Center. She graduated from Kansas State University with a Bachelor of Science degree in Medical Technology and Life Science. Additionally, she obtained a Master of Business Administration at Webster University.

Dr. Braden received a Doctor of Osteopathic Medicine from Kansas City University of Medicine and Biosciences-College of Osteopathic Medicine in Kansas City, MO. Working as a medical technologist for 14 years, she worked as a management analyst at TriCare then a Quality Improvement Coordinator for 23 hospitals in 16 states.

Her private practice of 16 years has been in internal medicine, emergency medicine and graduate medical education which began at POH Regional Medical Center, Pontiac, MI and currently, Parkview Medical Center and Southern Colorado Emergency Medicine Associates.

Dr. Braden resides in Pueblo, Colorado, and enjoys life with her two children and two beautiful granddaughters.