Joseph Christopher O'Mahoney was an American journalist, lawyer, and politician. A Democrat, he served four complete terms as a U.S. senator from Wyoming on two occasions, first from 1934 to 1953 and then again from 1954 to 1961.

Chelsea is a city in Suffolk County, Massachusetts, United States, directly across the Mystic River from Boston. At the 2020 census, Chelsea had a population of 40,787, making it the second most densely populated city in Massachusetts, behind Somerville. With a total area of 2.46 square miles (6.4 km2), Chelsea is the smallest city in Massachusetts in terms of total area. It is the city with the second-highest percentage of Latino residents in Massachusetts, behind Lawrence.