Dr. James A. Mahoney spent 40 years serving hospitals in low-income communities.

He would work day shifts at an intensive care unit at the University Hospital of Brooklyn and then work nights across the street at Kings County Hospital Center, according to The New York Times.

When he wasn’t treating clients in person, he was conducting digital visits with his regular patients from home, ensuring they were washing their hands and taking other safety precautions.

While many New York hospitals were overwhelmed by the onslaught of patients at the peak of the virus outbreak and lacked necessary medical equipment, the University Hospital of Brooklyn was in dire straits both before and during the crisis, The New York Times reported.

One of the intensive care units even had to separate patients with plastic tarps and duct tape.