Finkelstein, a Dunster House resident and government concentrator, will study economics at Oxford.
Tseng, a Cabot House resident and linguistics concentrator, will study cognitive science at Edinburgh.
And Wexler, a Dunster House resident and social studies concentrator who is also a Crimson editor, will study the history of medicine at Oxford.
Harvard was tied with Princeton for the most Marshall Scholars, and they were followed by Yale and MIT with three each.
A total of 25 universities in the United States were represented by the 15 women and 25 men who won the prestigious scholarships.
"Every year is always a reassurance of the American educational process to see the caliber of those who not only win but, honestly, all those who apply," said Terri Evans, Press and Public Affairs Officer for the British consulate General of Boston