Timothy and Johanna Dowdle

William Thompson Sedgwick (December 29, 1855 – January 25, 1921) was a teacher, epidemiologist, bacteriologist, and a key figure in shaping public health in the United States. Focused on eliminating typhoid, Sedgwick helped create the Sedgwick-Rafter method, a way to count the prevalence of waterborne microorganisms. He later advocated for the United States' first citywide sand filter for water purification, installed in Lawrence, Massachusetts. He was president of many scientific and profession…