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USAP-Colorado

A rich Rocky Mountain history

USAP-Colorado is a physician-led partnership of board certified anesthesiologists, care team members and practice management experts from Greater Colorado Anesthesia (GCA) and South Denver Anesthesiologists (SDA).

Our team of experienced professionals have served this area for more than four decades through two strong anesthesia groups that have now come together. From this new foundation, they will continue to meet the needs of our community well into the future.

We are now part of a national network of leading anesthesia providers and have the ability to truly transform anesthesia services across the country. We have access to new resources and best practices that will strengthen our ability to meet the demands of our community. With more than 3,000 team members, USAP is one of the only national companies exclusively dedicated to the practice of anesthesiology.

In addition, our integration as USAP-Colorado has allowed us to further build out our service delivery model so that as the facilities we serve require more complex and coordinated anesthesia services, we can support them. This will maintain the important relationships in place with surgeons and facilities to ensure clinical consistency and a continued high level of patient care.

Even though our name has changed, USAP-Colorado remains a Colorado-based practice. You will still work with the same, high-caliber teams that understand the needs of Colorado patients, surgeons, payers and health-care facilities. We remain rooted in—and committed to—Colorado.

Learn more about the former Greater Colorado Anesthesia (GCA) >

Learn more about the former Denver Anesthesiologists (SDA) >

Services and specialties

The spectrum of procedures USAP-Colorado supports is broad and includes:

  • Cardiovascular
  • Total Joint
  • Spine
  • Pediatrics
  • Chronic Pain Management
  • Orthopedics
  • Neurosurgery
  • Obstetrics
  • Otolaryngology
  • Post-Operative Pain Management
  • Bariatric surgery
  • Robotic surgery

Physician Leadership

Local leadership for our physician partners, right here in Colorado.

Peter Harkness, MD

Peter Harkness, MD, was Practice President of Greater Colorado Anesthesia (GCA). He previously led the Acute Pain Service, Recruitment Committees and served on the Board of Directors of Metro Denver Anesthesia before to its merger to form GCA.

Dr. Harkness earned his Doctorate of Medicine at Medical University of South Carolina and his Bachelor of Science degree at The Citadel in Charleston, South Carolina. He completed his residency at Yale-New Haven Hospital, where he served as Chief Resident his final year.

Matthew Maloney, M.D.

Matthew Maloney, MD went to medical school at the University of Iowa, College of Medicine, Iowa City, IA. He completed his residency in Family Practice at Cedar Rapids Medical Education Foundation, Cedar Rapids, IA and in Anesthesiology at the University of Colorado Hospital, Aurora, CO.

His memberships include American Academy of Family Practice Physicians, American Medical Association, American Society of Anesthesiologists, Colorado Medical Society, Colorado Society of Anesthesiologists, International Anesthesia Research Society, and the American Board of Anesthesiology (Certified).

Dr. Maloney served as President of the SDA Board of Directors.

Barbara Allen, MD

Barbara Allen, MD, is the Director of Professional Review for Greater Colorado Anesthesia (GCA) and serves on the Quality Management and Peri-operative Surgical Home Committees. She began her medical practice with Metro Denver Anesthesia in 1991 and was with Colorado Anesthesia Consultants (CAC) when it merged to become GCA in 2012.

Dr. Allen currently serves as Director of Anesthesia on the Board of Directors for Operation Walk Denver. Together with three other physicians, she founded Mending Faces, a cleft lip / cleft palate reconstruction medical mission in the Philippines, and served on the Board of Directors. Dr. Allen has participated in 28 Volunteer Medical Missions in South East Asia and Central America and served on the Metro Denver Anesthesia Board of Directors as well as the Board of Directors for GCA.

She previously served as Anesthesia Director for Kidney Stone Center of the Rocky Mountains; Chair of the Department of Anesthesia at Presbyterian / St. Luke’s Medical Center in Denver, and as the CAC/GCA Anesthesia Team Leader at Porter Adventist Hospital.

Dr. Allen served in the U.S. Army Reserve Medical Corp while earning her Doctorate of Medicine at Wright State University School of Medicine, during her Internship in Internal Medicine at Allegheny General Hospital in Pittsburgh and throughout her Residency in Anesthesia at the University of Colorado Health Sciences Center. She earned two Bachelor’s degrees: one in Chemistry from Miami University and one in Health Science from Case Western Reserve University.

Kris Burana, MD

Kris Burana serves as the Director of Quality for Greater Colorado Anesthesia (GCA) and as a member of the USAP Clinical Quality Committee. He is the former Chair of Peri-Operative Services at the Medical Center of Aurora and joined Metro Denver Anesthesia in 2006 and has served as a member of the Board of Directors since 2010.

Dr. Burana completed his anesthesia residency at Northwestern University–The Feinberg School of Medicine. He earned his Doctorate of Medicine at the University of Tennessee College of Medicine and his bachelor’s degree from Vanderbilt University.

Mark Ceraso, Rph., D.O.

Dr. Mark Cerasco went to medical school at University of Lake Erie College of Osteopathic Medicine, Erie, PA. He completed his residency at the University of Colorado School of Medicine, Denver, CO His memberships include the American Society of Anesthesiologists, Arapahoe Medical Society, Colorado Medical Society, American Board of Anesthesiology (Certified). He served as the Vice President of the SDA Board of Directors.

Yasser Dahab, MD

Yasser Dahab, MD, serves as the Director of the Acute Pain Service at Greater Colorado Anesthesia (GCA), and serves on the USAP Clinical Quality Committee and the Information Technology (IT) Committee. He is the acting Director of Clinical Information Technology on the USAP Denver Clinical Governance Board (CGB) where he oversaw the selection, implementation and management of the Electronic Health Record system for GCA. His current IT efforts are focused on measuring and reporting reliable, valuable clinical quality metrics.

Dr. Dahab's scope of practice in anesthesiology is broad, though his primary interests are regional anesthesia, orthopedics, and procedural and diagnostic ultrasound.

Dr. Dahab completed medical school at the Johns Hopkins School of Medicine and his residency in anesthesiology at The Johns Hopkins Hospital.

Mary Fox, MD

Mary Fox, M.D. serves on the Clinical Governance Board in Colorado as the pediatric representative. She is the site chief at Rocky Mountain Hospital for Children and she also serves on the USAP peer review committee in Colorado. She is involved in all aspects of the pediatric program for USAP in Colorado, including growth, development, scheduling, quality and continuing education.

Dr. Fox's scope of practice in pediatric anesthesiology is broad. However, her areas of greatest interest include general pediatric surgery, neonatal surgery, orthopedics and pediatric regional anesthesia. She has also worked with the oncologists at RMHC to develop an outpatient procedure protocol for pediatric patients undergoing chemotherapy. Dr. Fox graduated medical school at the Johns Hopkins School of Medicine and completed a pediatric residency at the Children's Hospital in Colorado. She then continued on to complete an anesthesia residency at the University of Colorado and her pediatric fellowship at the Children's Hospital. She is board certified in both Anesthesia and in Pediatric Anesthesia.

John Haworth, M.D.

Dr. John Haworth completed medical school at Albany Medical College and his residency at Loma Linda University School of Medicine.

He is a member of the American Society of Anesthesiologists, Colorado Society of Anesthesiologists, Colorado Medical Society, Arapahoe-Douglas-Elbert Medical Society and the American Board of Anesthesiology (Certified).

Dr. Haworth was a member of the SDA Board of Directors.

Scott Hope, M.D.

Dr. Scott Hope completed medical school at Indiana University School of Medicine and his residency at Indiana University School of Medicine.

He is a member of the American Society of Regional Anesthesia and Pain Medicine,American Society of Anesthesiologists, Colorado Society of Anesthesiologists, Colorado Medical Society and the American Board of Anesthesiology (Certified).

Dr. Hope served as Secretary of the SDA Board of Directors.

Michael Hurley, M.D.

Dr. Michael Hurley completed medical school at Temple University School of Medicine and his residency at Loyola University Medical Center.

Dr. Hurley is a member of the Colorado Medical Society, American Medical Society, American Society of Anesthesiologists and the American Board of Anesthesiology (Certified).

He was a member of the SDA Board of Directors.

Scott Klein, MD

Scott Klein joined the legacy group, South Denver Anesthesiologists in 2012, after spending four years in an academic position. Scott is currently Co-Chair of both the USAP Colorado Quality Committee, as well as the USAP Colorado Perioperative Surgical Home Committee. In addition, Scott serves on the USAP Colorado Clinical Governance Board. His primary interest is implementing solutions to allow USAP Colorado to drive the preoperative optimization of surgical patients.

Scott practices General Anesthesiology, with an emphasis on Neurosurgical and Orthopedic cases. Scott serves on the USAP Colorado Acute Pain Service, and enjoys utilizing regional anesthetic techniques to improve perioperative pain management.

Paul Krummen, M.D., MHA

Dr. Paul Krummen went to medical school at Ohio State University College of Medicine and Public Health. He completed his residency at the Cleveland Clinic, Cleveland, OH

Dr. Krummen's memberships include the American Society of Anesthesiologists, American Society of Regional Anesthesiologists, Colorado Society of Anesthesiologists, Colorado Medical Society and the American Board of Anesthesiology (Certified).

He served as Treasurer, SDA Board of Directors.

Mauricio Mejia, MD

Mauricio Mejia, MD, served on the Greater Colorado Anesthesia (GCA) Peri-operative Surgical Home and Compliance Committees. He also serves as Medical Director of the National Jewish Minimally Invasive Diagnostic Center (MIDC); the Provider Advisory Group for Electronic Medical Records & Order Entry for HealthOne–Rose Medical Center; the Multi-Disciplinary Quality Improvement Committee for Centura Health–Parker Adventist Hospital; and on the Bundled Payment Pilot Study for Total Joint Replacement at Centura Health–Porter Adventist Hospital.

Dr. Mejia earned his Doctorate of Medicine at the University of Colorado School of Medicine, graduating with honors in Anesthesiology, Cardiology, Dermatology, Epidemiology, Immunology, General Pediatrics and Internal Medicine. He studied Pediatric ICU Rotation at Harvard University Medical Center, Boston Children’s Hospital, and studied Emergency Medicine Rotation at Hospital Universitario del Valle in Cali, Colombia. Dr. Mejia earned his Bachelor of Science degree in Biomedical-Mechanical Engineering with minors in Biology and Spanish from the University of Southern California in Los Angeles, California.

Dr. Mejia completed Anesthesiology Residencies at University of Texas Southwestern Medical Center Parkland Hospital at Baylor University; Children’s Medical Center, St Paul Medical Center Veteran’s Administration Hospital in Dallas, Texas and a Pediatric Internship at Stanford University Medical Center–Lucile Packard Children’s Hospital at Stanford, located in Palo Alto, California.

Aaron Rea, MD

Aaron Rea, MD, is Vice President of Scheduling for Greater Colorado Anesthesia (GCA). He currently serves on the Clinical Governance Board and is a prior member of the GCA Board of Directors and Metro Denver Anesthesia (MDA) Board of Directors.

Dr. Rea served as the Director of the Acute Pain Services from 2011–2014 for MDA and GCA. He completed his residency in Anesthesiology at The Johns Hopkins Hospital and served as Chief Resident during his final year of training. Dr. Rea earned his Doctorate of Medicine from The University of Nebraska College of Medicine.

Chris Strouse, MD

Chris Strouse, MD, currently serves as Vice Chair of the Clinical Governance Board and on the USAP Board of Directors. He is the Medical Director of Surgery Center of the Rockies and was a Partner Anesthesiologist with Greater Colorado Anesthesia (GCA).

Dr. Strouse joined Metro Denver Anesthesia in 2009, serving on the Board of Directors in 2012 when the practice merged to become GCA. He served as Treasurer of GCA Board of Directors (2012-2014), currently is Chair of the GCA Growth Committee and serves on the Human Resources & Benefits Committee.

Dr. Strouse is a board certified anesthesiologist with a focus in orthopedics/regional, obstetrics (Ob) and ambulatory medicine. He completed his undergrad at Texas A&M University and his medical school and Residency at The University of Texas (UT) Health Science Center at Houston.

David R. Theil, MD

David Theil, MD, currently serves on the Clinical Governance Board on the local Compliance Committee.

Dr. Theil completed medical school at Indiana University School of Medicine in 1983. He performed a residency in Internal Medicine at the University of North Carolina in Chapel Hill, NC (1983-1986) and in Anesthesiology at Duke University Medical Center in Durham, NC (1998-1990). He became an attending anesthesiologist at Duke in January, 1991. During his time at Duke, Dr. Theil performed pulmonary research at the F.G. Hall Environmental Lab, assisting in studies on pulmonary hypertension and the toxic effects of oxygen on the lung.

In September, 1991, Dr. Theil accepted a position at Rose Medical Center in Denver. He served as Chairman of the Rose Anesthesia Quality Improvement Committee from 1992-1996. In 1996 he was named Chairman of the Department of Anesthesia at Rose, and he remains in that position today.

In addition to his administrative duties, Dr. Theil has a broad clinical practice which includes cardiac and obstetric anesthesia, and chronic pain management. He maintains a special interest in advanced airway techniques and frequently instructs Pulmonary Fellows from the University of Colorado School of Medicine in emergency airway management. He also serves on the Medical Advisory Board for Teleflex Medical, Inc helping to assess new airway devices and other anesthesia products. Dr. Theil also regularly travels to Arusha, Tanzania to provide anesthesia for reconstructive surgeries on pediatric patients with cleft lips and palates, severe burn scars and other deformities.