People

Portrait of Ahmad Hassan, MD

Ahmad Hassan, MD

Medical School: WashU Medicine

Portrait of Shawn Hassani, MD

Shawn Hassani, MD

Dual CCM/EM Fellow (2024)

Medical School: Florida State University College of Medicine

Residency: University of Cincinnati College of Medicine — Emergency Medicine

Portrait of David Hastie, MD

David Hastie, MD

Dual CCM (2015)/ACTA Fellow (2016)

Medical School: University of Texas Southwestern Medical School

Residency: WashU Medicine

Portrait of Taylor Hathaway, MD

Taylor Hathaway, MD

Medical School: Indiana University School of Medicine

Portrait of Taylor Hathaway, MD

Taylor Hathaway, MD

Resident Physician

Department of Anesthesiology Featured Member: January 2026

Taylor Hathaway is a CA-2 resident in the Department of Anesthesiology at WashU Medicine. Born and raised in the Midwest, he received a Bachelor of Science in Microbiology at Brigham Young University and attended medical school back home at Indiana University. He and his wife, Jenny, have three young children ages 6, 4, and 18 months, and another is on the way — due summer 2026! He plans on staying in St Louis after residency and working as a general anesthesiologist.

Outside of work, Taylor enjoys soccer and baseball, and often sports a Cincinnati Reds baseball scrub cap at work. He recently ran his first (and probably only) half-marathon and marathon this last year thanks to a challenge from another co-resident, Peter Wittl. In his free time (limited as it is), he enjoys reading epic fantasy fiction or sci-fi and is always open to new book recommendations.

Isabel Haupfear

Isabel Haupfear, MBBS

Medical School: Trinity College Dublin School of Medicine

Portrait of Mike Havenar, ACNP

Mike Havenar, ACNP

Nurse Practitioner

Department of Anesthesiology Featured Member: June 2020

Mike is the Compliance and Outreach Lead Nurse Practitioner with the Critical Care Division of the Department of Anesthesiology, and he has been with the department for 11 years. He was born and raised in central Illinois but moved to the St. Louis area for college and completed his undergraduate training at Southern Illinois University Edwardsville and graduate training at Saint Louis University. Before going to grad school, Mike was a travel nurse for three years and lived in Arizona, South Florida, and Southern California. Outside of work, Mike has a passion for international travel, SCUBA diving, hiking, cooking, and spending time with family, friends, and his dog, Leo.

Portrait of Mike Havenar, ACNP

Mike Havenar, ACNP

Nurse Practitioner

Portrait of Jennifer Hawkins, CRNA

Jennifer Hawkins, CRNA

Certified Registered Nurse Anesthetist

Mallory Hawksworth, MD