Board of Directors
Board service is one of the toughest roles of all, and the following volunteers perform with dedication and tenacity. We are proud to have them at the helm of our association. 

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

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 has served on the Board of Directors for the Colorado Medical Society, representing the Pueblo County Medical Society.

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/CMS Council on Ethical and Judicial Affairs (CEJA) Representative


Jacob Mathew, Jr. grew up in Hudson, OH and graduated from Miami University in Oxford, OH with both a Bachelor of Arts and Bachelor of Science in Zoology with a minor in Statistical Methods. He was a founding member of the Phi Delta Epsilon medical fraternity along with his participation in multiple other medical organizations on campus. While in college, he founded a website design company that was featured in local magazines and newspapers through the Cincinnati, Ohio region. He received his degree in osteopathic medicine from the Arizona College of Osteopathic Medicine in 2012, was promoted to Captain in the United States Army, and went on to complete his internship and residency in internal medicine at Tripler Army Medical Center in 2015. During residency he was part of nine hospital committees and was chosen as the Army's Internal Medicine representative, and the only resident on the panel, for the military's electronic record modernization project (to replace their current AHLTA EHR). Along with the three performance improvement projects he started during his residency, he was responsible for implementing three new protocols in the hospital and was first author on eight publications during his three-year residency. To help other residents, he wrote a 700+ page book titled the Intern Survival Guide that has been published on Amazon and is currently being distributed to interns in both the IM and FM residency programs at Tripler. During his residency he completed a two-year certificate program in Healthcare Simulation through the Naval Postgraduate School. His research during residency included areas of Rheumatology, Infectious Disease, and Critical Care. He participated in three poster presentations and three oral presentations in Hawaii.

After completing residency in 2015, he completed the flight surgeon course at Fort Rucker, AL and was stationed at Fort Carson, Colorado as a flight surgeon for the 404th aviation support battalion in the 4th combat aviation brigade. In 2016 he was deployed to Afghanistan in support of Operation Freedom's Sentinel where he was the sole flight surgeon for southern and eastern Afghanistan supporting both the US Army and US Air Force. After his first deployment, he then moved to serve as the flight surgeon for the third attack helicopter battalion. There, he developed two excel-based programs that are being utilized at the FORSCOM and 4th Infantry Division level resulting in an award for outstanding achievement in aviation. He then deployed a second time to Germany to establish medical operations for the combat aviation brigade. He holds fellowships in the American College of Osteopathic Internists, American College of Physicians, and Academy of Wilderness Medicine and is a certified simulation health educator (CHSE). His passion lies with academic medicine and training the future doctors of America. He has held the title of assistant professor of medicine at four universities and currently serves as an academic staff physician at Parkview Medical Center’s Internal Medicine Residency in Pueblo, Colorado..


Dr. Brittany Carver,  D.O.
Board Member/
CMS Board Representative
Dr. Carver is a third generation Pueblo native who graduated from South High School.  She subsequently went on to pursue her undergraduate education, on a soccer scholarship, at Colorado State University-Pueblo.  She graduated with her Bachelor of Science degree in 2009.  She left Pueblo but chose to stay in Colorado for medical school at Rocky Vista University, graduating in 2014.  Her emergency medicine residency was completed at Integris Southwest Medical Center in Oklahoma City in 2018.  She returned to Pueblo and currently practices at Parkview Medical Center. 

Brittany understands the unique diversity and culture of this city and is dedicated to serving Pueblo.  She and her husband both have deep roots in the Pueblo community, including family ties to nursing, ems, fire, and law enforcement.