From 1900 Brett spent two years as a Fellow at the American School of Classical Studies at Athens.
[4] In 1910 Brett became the first female curator at the American Numismatic Society and remained closely connected with the institution until her death.
[10] The President of the Royal Numismatic Society, Harold Mattingly, noted that Brett was the second American (after Edward T. Newell), and the second female (after Helen Farquhar) to receive the Medal.
Mattingly concluded his speech by noting The award of the Medal marks our appreciation of distinguished services to numismatic studies - primarily, that and nothing else.
There is a collection of photographs taken by Agnes Baldwin Brett at the American Numismatic Society from her travels between 1900 and 1909 through Bermuda, Greece, France, Italy, Turkey, and Great Britain.