Elliot Health System is a non-profit organization serving your healthcare needs since 1890.

Critical Care

Elliot Hospital
1 Elliot Way
Manchester, NH 03103



The Elliot Critical Care Team


Christopher Brauer, MD

Dr. Brauer has been working at the Elliot Hospital since 2002 as a Hospitalist and began as a dedicated Intensivist when the program began in 2006. His medical training was in New York City at Mount Sinai Medical School where he earned his medical degree in 1999. Dr. Brauer completed his residency training in Internal Medicine in Boston at Beth Israel Deaconess Medical Center from 1999 to 2002. Dr. Brauer is board certified in internal medicine.

His clinical interests include clinical ethics, end of life care, the diagnosis, prevention and treatment of acute ICU delirium.


Kevin Desrosiers, MD

Dr. Desrosiers joined the Elliot in 2010. He is an adult intensive care physician and serves as the Chief Medical Officer for Elliot Hospital and Elliot Medical Group’s Acute Care Services. He completed medical school at Dartmouth Medical School in Lebanon, NH. He then completed his internship as well as residencies in Internal Medicine, and Preventive Medicine at Dartmouth-Hitchcock Medical Center. He also completed a fellowship in Critical Care Medicine at Dartmouth-Hitchcock Medical Center. In additional to clinical work, Dr. Desrosiers has a strong interest in Public Health and Hospital Administration and completed a Master’s in Public Health Degree at the Dartmouth Institute for Health Policy and Clinical Practice.


Emily Giesen, DO

Emily Giesen, DO received her Fellowship training in Critical Care at Dartmouth-Hitchcock Medical Center in Lebanon, NH. She earned her Medical degree at Western University of Health Sciences COMP-Northwest in Lebanon, OR.

Dr. Giesen’s areas of expertise include: Critical Care medicine and Internal medicine. Dr. Giesen joins the Elliot Hospital and Southern New Hampshire Medical Center Intensive Care Units bringing her expertise from Dartmouth Hitchcock Medical Center in Lebanon, NH and White River Junction VA in White River Junction, VT.

Dr. Giesen is passionate about all aspects of critical care, but she particularly enjoys the teamwork of critical care, managing severe sepsis, end of life care and serious illness conversations. Supporting and guiding patients and their families through some of the most difficult times in their lives is the aspect of her work she values most.

When away from the hospital, she enjoys the outdoors, running, cycling, gardening, cooking and spending time with friends and family.


Tipton Hartman-Heaney, DO

Dr. Hartman-Heaney joined the Intensivist Program at Elliot Hospital in 2012 after completing her fellowship in Critical Care Medicine at Baystate Hospital in Springfield, MA. Her undergraduate studies at Indiana University were in History and Political Science, and she completed a masters in political science at Tulane University.

After a first career as an Outward Bound instructor and course director -where a wilderness EMT course sparked her interest in medicine- she studied pre-med in a post-baccalaureate program at Bennington College. After three years of research in angiogenesis at Columbia University, she completed her medical degree at New York College of Osteopathic Medicine in 2006. She completed her residency in Internal Medicine at Bassett Medical Center in Central New York in 2009 and served an additional year as Chief Resident.

Her current clinical interests include sepsis, wilderness and disaster medicine, and sedation and mobility in the ICU. She is an active member of the Code Blue, ICU Mobility, Credentials, Disaster Response and Government and Legislative Affairs Committees. She is board certified in Internal Medicine and Critical Care Medicine.


Katherine Hults, PA-C, MPAS

Katherine Hults, PA-C, MPAS completed her Master of Physician Assistant Studies at the Massachusetts College of Pharmacy and Health Sciences and received her Bachelor of Science in Biomedical Science at the University of New Hampshire.

Prior to joining Elliot Hospital’s Intensive Care Unit, Katherine spent three years working in the Medical Intensive Care Unit at Dartmouth-Hitchcock Medical Center where she was able to grow her Critical Care knowledge base. Katherine enjoys being able to provide care to critically ill patients with compassion and dignity.

When away from the hospital, she loves baking, playing with her dog, and spending time with her family.



Lorenzo Klein, MD

Dr. Klein obtained his medical degree from Hanover Medical School in Germany. He completed his residency at the University of Rochester Medical Center and obtained his fellowship at the Mayo Clinic in Rochester, Minnesota.

Dr. Klein joined the organization as a physician with Foundation Pulmonary in 2015 and moved to the Critical Care program at Solution Health in December of 2020.

Dr. Klein is board certified in internal medicine, pulmonary medicine, and critical care medicine.


Steve Loosigian, DO, ALM, MBA

Dr. Loosigian has been with the Elliot for 20 years. He is the medical director of the Hospitalist program at Elliot Hospital and much of his clinical practice involves critical care medicine. Dr. Loosigian completed his internship and residency in internal medicine at St. Elizabeth's Medical Center in Boston.

Dr. Loosigian graduated from medical school at the University of New England in Maine. He also completed an MBA from University of Massachusetts as well as a master’s degree in biology from Harvard University and a Bachelor of Arts in economics from the University of Colorado. Dr. Loosigian is board certified in internal medicine.

Dr. Loosigian is the current president of the Elliot medical staff as well as a board member of the Elliot Health System.

Dr. Loosigian is also a current and founding board member of Solution Health.



Stephen Marko, MD, MPH

Stephen Marko, MD, MPH received his fellowship training in Critical Care at Dartmouth-Hitchcock Medical Center. He earned his Medical degree as well as his Master of Public Health degree at the University of Connecticut School of Medicine and completed a residency in Emergency Medicine at the Yale School of Medicine.

Dr. Marko joins the Elliot Hospital’s Intensive Care Unit bringing his expertise from Dartmouth-Hitchcock Medical Center, Yale-New Haven Hospital, Bridgeport Hospital, and the Veterans Affairs Medical Centers in both West Haven, CT and White River Junction, VT. In addition, he is a Medical Officer in the US Navy Reserve, caring for the Marines and Sailors who serve our country.

Dr. Marko is passionate about treating both critically ill patients and emergency patients with empathy and humanity during what could be one of the most challenging times in their lives.

When away from the hospital, he enjoys running, gardening, and spending time with his wife, dogs, and growing family.


Laura McPhee, DO

Dr. McPhee joined the intensivist program at Elliot Hospital in 2011 after completing her internal medicine residency and pulmonary-critical care fellowship at Maine Medical Center in Portland. She graduated from medical school at the University of New England College of Osteopathic Medicine in 2005. She is board-certified in internal medicine, pulmonary medicine, and critical care medicine.

Dr. McPhee enjoys all aspects of critical care, with specific interests in improving family-centered patient care through implementation and continual development of the ICU liberation bundles.

When not working, she enjoys running, biking, exploring the outdoors, and spending time with her husband and two children.


Siva Sivakumar, MD, FACP, FCCP

Siva Sivakumar, MD, FACP, FCCP received his Fellowship training in Critical Care and Pulmonary at the Brookdale University Hospital Medical Center and the University of Texas At Medical Branch at Galveston. He earned his medical degree from Thanjavur Medical College affiliated with Baratidasan University Thanjavur,India. Dr. Sivakumar’s areas of expertise include: Pulmonary medicine, Critical Care, and Internal medicine. Dr. Sivakumar joins Elliot Hospital’s Intensive Care Unit team bringing his expertise from various hospital systems in multiple states including Southern New Hampshire Medical Center.Dr. Sivakumar is passionate about treating critically ill patients and treating each with empathy and humanity during what could be one of the most challenging times in their lives.

When away from the hospital, he enjoys long distance bicycling, traveling and music.


Lisa Webb, PA-C, MPAS

Lisa Webb, MPAS, PA-C received her Bachelor of Science in Biology from Saint Anselm College in Manchester, NH. She graduated from Arizona School of Health Sciences in 1998 with a Master of Physician Assistant Studies. She practiced Emergency Medicine at St. Joseph’s Hospital, a Level I Trauma Center in Phoenix, AZ.

Having grown up in Londonderry, NH, Lisa returned to her home state and joined the Elliot Hospital- Emergency Medical Specialists in 2001. As a recent addition to the Elliot Hospital Intensive Care Unit, she brings twenty years of experience of caring for patient requiring acute or life-saving measures. She believes in providing compassionate care to acutely ill patients in her local community.

Her personal interests include running, hiking with her dog and traveling with her family.



Michelle Winchell, DO

Michelle Winchell, DO received her Fellowship training in Critical Care at Strong Memorial Hospital in Rochester, NY. She earned her Medical degree at the Lake Erie College of Osteopathic Medicine in Bradenton, FL.

Dr. Winchell’s areas of expertise include: Critical Care medicine and Internal medicine. Dr. Winchell joins the Elliot Hospital and Southern New Hampshire Medical Center Intensive Care Units bringing her expertise from Strong Memorial Hospital in Rochester, NY.

Dr. Winchell is passionate about patient safety and quality critical care in medicine.

When away from the hospital, she enjoys hiking, yoga, and getting outdoors.