Chandra Sorrelle graduated from University of Arizona December 2018 with Doctor of Nursing Practice with emphasis in Adult-Gerontology Acute Care. After graduation, she specialized in Pulmonology and has over 5 years of experience in the specialty.
Dr. Patel has practiced pulmonary and sleep medicine in Columbus, GA for over 40 years. He completed his Pulmonary Fellowship at the University of Louisville from 1981-1983.
Dr. Don Robinson is a pulmonologist in Macon, Georgia and is affiliated with multiple hospitals in the area, including Piedmont Macon Hospital and Atrium Health Navicent Medical Center. He received his medical degree from the Medical College of Georgia and has been in practice in Macon for decades.
Dr. Jon Dean, a native of Columbus, GA, graduated from Brookstone High School in 1978 and earned his BS in Biology from Mercer University in 1982. He completed his medical degree at the Medical College of Georgia in 1986, followed by an Internal Medicine residency and a fellowship in Pulmonary Medicine, which he finished in 1991. Since 1992, Dr. Dean has practiced pulmonology in Macon, GA, serving in both private practice and academic roles.
In 1996, Dr. Dean joined the faculty at Mercer University School of Medicine, where he taught pulmonary and critical care medicine, eventually becoming Chair of the Department of Internal Medicine and Program Director for the residency program. He is currently on staff at Atrium Navicent Health, Piedmont Macon, and Regency Hospital. Board-certified in Internal Medicine and Pulmonary Medicine, Dr. Dean's clinical interests include COPD and lung cancer diagnosis. He has also served as President of the Bibb County Medical Society.
Dr. Mark Hendricks, a native of Georgia, earned his Bachelor of Science in Biology from the University of Georgia in 1995 before pursuing his medical degree at the Medical College of Georgia. Following his graduation, Dr. Hendricks completed a fellowship in pulmonary, critical care, and sleep medicine at the Medical College of Georgia in Augusta in 2001. Since then, he has been in private practice in Macon, Georgia, where he has built a reputation for his expertise in lung cancer, asthma, and sleep medicine.
Dr. Hendricks is married to his wife, Shelly, and together they have two children, Matthew and Ruthie. In addition to his professional work, Dr. Hendricks enjoys spending time with his family and is deeply committed to advancing patient care in his fields of interest.
Angela graduated from Samford University in 1986 with her BSN, and worked in various medical specialties. She graduated from Troy University in 2017 with her MSN as a Family Nurse Practitioner. She joined Central Georgia Pulmonary Associates, now Nimbus Health, in 2021.
Kimberly graduated from Georgia College and State University in 2012 with her BSN and worked in the ICU. She graduated from Georgia College and State University with her MSN as a Family Nurse Practitioner in 2017 and with her Doctor of Nursing Practice in 2018. She practiced in the ER for two years before transitioning to pulmonary medicine. She joined Central Georgia Pulmonary Associates, now Nimbus Health, in 2019.
Ali graduated from the University of Georgia in 1998 with a bachelors of science in forest resources before deciding to go back and study nursing. She graduated from Medical College of Georgia in 2002 with her BSN. She worked in the emergency department for 10 years before going back for her MSN. She graduated from Georgia College and State University in 2013. She joined Central Georgia pulmonary, now Nimbus health, just a few months after graduation.
Shannon Valenzuela MD is a board-certified pulmonologist. She received her undergraduate degree at Arizona State University. She completed medical school at University of Arizona. She has over 25 years of experience. She loves caring for her patients and remains dedicated to her practice. An Arizona native, she was born and raised in Prescott. She is married for 30 years and blessed with 2 amazing daughters. She loves traveling, reading, and the outdoors!
Dr. Jonathan Eytan Marcus is a board-certified Pulmonary and Critical Care Physician based in Boca Raton, Florida. He graduated from Yeshiva University and Rutgers Robert Wood Johnson Medical School and joined ICC Healthcare in 2008, where he rapidly advanced to Chief Medical Officer. As CMO, he led the development of clinical programs, standardized protocols, and a quality-focused intensivist program, ultimately growing ICC to be the largest Intensivist Group in the U.S., with over 500 providers.
Following ICC's acquisition by HCA Healthcare, Dr. Marcus played a key role in integrating ICC’s protocols into HCA’s national critical care platform. He contributed to numerous quality initiatives, created a national ICU dashboard for real-time outcomes monitoring, and established a fellowship program training over 2,200 critical care physicians. From 2011 to 2015, he also led Nuview Healthcare's Tele-Intensivist Group and developed the model for HCA’s Tele-ICU Network.
In 2018, he founded Optimum ICU Solutions, consulting on critical care program development for hospitals. During the COVID-19 pandemic, Dr. Marcus served as a Critical Care Specialist at Delray Medical Center and was appointed Director of Clinical Operations for The Genesis Group. He also joined Robotic Critical Care Services as a tele-intensivist and tele-pulmonologist.
Dr. Marcus, a recognized leader in Clinical Informatics, has developed critical care decision-making algorithms and served on multiple HCA leadership committees. He lives in Boca Raton with his wife and five children and enjoys competitive basketball, painting, landscape design, cooking, and reading.
Dr. Andrew Freedman is board-certified in Pulmonary Medicine, Sleep Medicine, Critical Care Medicine, and Internal Medicine, and has been in practice for over 35 years.
- MD degree Rutgers-New Jersey Medical School in 1979
- Medicine Residency-University Hospital affiliated program, Newark, NJ
- Chief Resident, Medicine-Newark Beth Israel Medical Center.
- Pulmonary Fellowship-Temple University Hospital, Philadelphia, Pennsylvania
- Pulmonary Research Fellowship-Robert Wood Johnson University Hospital, New Brunswick, NJ
After completion of his training in 1985 Dr. Freedman entered private practice in New Jersey, with a primary hospital affiliation with Robert Wood Johnson University Hospital, New Brunswick, NJ. Since 2014, anticipating the future transformation of the health care landscape, he has been actively involved in the delivery of health care through telemedicine. Licensed now in many states and internationally, Dr Freedman is looking to explore and expand the reaches of telemedicine. Presently he is affiliated with Pulmonary and Sleep Medicine Group LLC and Robotic Critical Care Services.
Vanessa Frazier, FNP-C, is a board-certified Family Nurse Practitioner with a robust foundation in critical care nursing. She obtained her Bachelor of Science degree from Ashland University and advanced her studies at The University of Phoenix, where she received a Master of Science degree. Certified by the American Academy of Nurse Practitioners, she possesses significant expertise in surgical intensive care nursing, which enhances her comprehension of pathophysiology. In 2021, Vanessa moved to Arizona with her husband, and she enjoys traveling, outdoor activities, and the performing arts.
Board certified in pulmonary disease, sleep medicine and internal medicine, Dr. Rundbaken is a Fellow of the American College of Osteopathic Internists and the College of Chest Physicians.After earning his doctorate at Des Moines University, he completed his residency in internal medicine at Garden City Community Hospital, in conjunction with Michigan State University, and his Pulmonary Fellowship at Botsford General Hospital in Farmington Hills, Michigan.Since his move to Arizona in 1997, Dr. Rundbaken has served as a general pulmonologist treating a variety of pulmonary disorders including COPD, asthma, lung nodules, and our local endemic disease - Valley Fever. When required for diagnoses, bronchoscopies are performed at Banner Health facilities.Dr Rundbaken schedules in-office patient visits Monday through Friday and continues to make hospital rounds.
Shannon Valenzuela MD is a board-certified pulmonologist. She received her undergraduate degree at Arizona State University. She completed medical school at University of Arizona. She has over 25 years of experience. She loves caring for her patients and remains dedicated to her practice. An Arizona native, she was born and raised in Prescott. She is married for 30 years and blessed with 2 amazing daughters. She loves traveling, reading, and the outdoors!
Michael B. Denenberg, MD is a board-certified specialist in Pulmonary Medicine and Sleep Medicine. He completed his medical education at the Chicago Medical School and his residency at Beth Israel Medical Center. Following residency, Dr. Denenberg pursued advanced fellowship training at Northwestern University Medical Center, where he honed his expertise in pulmonary and sleep medicine.
Dr. Denenberg is affiliated with Piedmont Medical Center, where he is actively involved in patient care, conducting hospital rounds and attending to consultations. With a deep commitment to patient well-being, he is known for his thorough approach to diagnosing and treating a wide range of pulmonary and sleep-related conditions.
Brittany E. Root, FNP-C is a certified Family Nurse Practitioner with a diverse background in critical care and emergency nursing. She earned her Bachelor of Science degree from the University of South Carolina and completed her nursing education at York Technical College. Brittany furthered her education at Simmons University, where she became a Family Nurse Practitioner.
She holds board certification from the American Academy of Nurse Practitioners and has extensive professional experience, having worked as an Emergency Room Nurse and a Surgical Trauma Intensive Care Nurse. This background equips her with a broad skill set and a deep understanding of patient care in high-pressure environments.
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