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ANTIDOTE Class of 2021

Advancing New Toxicology Investigators In Drug Abuse and Original Translational Research Efforts (ANTIDOTE) a collaboration between the ToxInnovation Lab (UMASS) and The Chai Lab (Harvard Medical School), and sponsored by ACMT. The ANTIDOTE Institute was initiated in 2021 by Dr. Stephanie Carreiro and Dr. Peter Chai. This program provides an opportunity for fellows and junior faculty to begin to develop their own area of investigation, network with peers and experienced investigators in the field, and gather practical knowledge on topics core to developing a successful research program. Meet the class of 2021!

Kevin Baumgartner, MD

Washington University School of Medicine
St. Louis, MI


Kevin Baumgartner, MD, is an emergency medicine physician and medical toxicologist. He trained in Emergency Medicine and Medical Toxicology at Washington University School of Medicine and now joins the Division of Medical Toxicology as an Assistant Professor. He is the co-director of the Introduction to Addiction Medicine medical student elective and a member of the editorial board of Clinical Toxicology. Dr. Baumgartner's research and clinical interests include addiction medicine, quality improvement, psychopharmacology, and snake envenomation.

Joseph Carpenter, MD

Emory University School of Medicine
Atlanta, GA


Joseph Carpenter, MD is an Assistant Professor in the Medical Toxicology Section, Department of Emergency Medicine at the Emory University School of Medicine. He is a graduate of Brown University and the Stanford University School of Medicine. Dr. Carpenter completed his residency in emergency medicine at Los Angeles County Harbor-UCLA Medical Center and fellowship in medical toxicology at Emory University and the Centers of Disease Control and Prevention. His clinical time is split between Grady Memorial Hospital’s emergency department, medically assisted opioid treatment clinic, and medical toxicology consultation service, as well as the Georgia Poison Center. His research interests lie at the growing intersection of emergency medicine, medical toxicology, and addiction medicine.

Mary Billington, MD

University of Texas Health and Science Center
Houston, TX


Dr. Mary Billington is a board-certified medical toxicologist and emergency medicine physician. She completed both Emergency Medicine Residency and Medical Toxicology Fellowship at Parkland Hospital. She currently holds the academic position of Assistant Professor of Emergency Medicine at the University of Texas Health and Science Center in Houston, TX. The application of mathematical modeling and analysis to the field of toxicology is her primary research interest.

Aaron S. Frey, DO

University of Virginia Toxicology Fellowship
Charlottesville, VA


Dr. Aaron Frey was born and raised in Forest, Virginia. He moved to North Carolina to attend Campbell University for his undergraduate education where he double majored in Spanish and government with a concentration in international studies and minored in history. While in North Carolina, he became a firefighter and emergency medicine technician. His first responder experiences made him want to pursue a career in medicine. He obtained the prerequisite medical school courses from Campbell University and became a student researcher in the cellular biology department. He attended the Via College of Osteopathic Medicine in Blacksburg, Virginia where he continued to work as a student researcher. There, he studied the protective effects of cerium oxide nanoparticles in traumatic brain injury and Parkinson’s Disease. He completed an emergency medicine residency at the Lehigh Valley Health Network in Allentown, Pennsylvania in 2019. He worked in a small, resource-limited hospital in northeast Pennsylvania during the COVID-19 pandemic and treated many critically ill patients. He then decided to pursue additional training in medical toxicology and is currently a medical toxicology fellow at the University of Virginia.

Marc Rigatti, MD, PhD

University of Massachusetts Toxicology Fellowship
North Worcester, MA


Marc Rigatti MD, PhD is currently a senior medical toxicology fellow at UMass Medical School. He began his education at Eastern Connecticut State University and graduated with degrees in biochemistry and biology. He then moved on to University of Connecticut, where he earned a Master’s in biochemistry while studying the chemotherapeutic potential of mdm2 inhibitors in colorectal cancer. Dr. Rigatti completed his MD/PhD at the UConn School of medicine in 2017. He earned his PhD in cell analysis and modeling by studying the biophysical mechanisms that allow A Kinase Anchoring Proteins coordinate PKA signaling microdomains, thereby regulating phosphorylation of specific PKA substrates. Dr. Rigatti completed a residency in emergency medicine at the UConn Emergency Medicine Program in Hartford, CT, where he also served as chief resident. His current research interests focus on the use of wearable biosensors and machine learning to measure pain severity and to detect states of intoxication.

Christopher Watson, MD

Harvard Medical Toxicology Fellowship
Boston, MA


Dr. Watson is a second-year medical toxicology fellow with the Harvard Medical Toxicology Program at Boston Children’s Hospital and the Regional Center for Poison Control and Prevention Serving Massachusetts and Rhode Island, as well as an emergency medicine physician at Beth Israel Deaconess Medical Center (BIDMC) in Boston, Massachusetts. A native of Portland, Maine, Dr. Watson completed medical school at The University of Chicago Pritzker School of Medicine and residency training at the BIDMC Harvard Affiliated Emergency Medicine Residency. He has strong clinical and academic interests in resource utilization with regards to toxicologic emergencies.