Portrait of Collitz at approximately 65 years old.

Outdoor portrait of Anderson at approximately 40 years old.

Candid photograph of President Wilson at 62 years old marching in the Fourth Liberty Load Parade.

Candid photograph of Thornton at approximately 36 years old using a balance in the back of the first floor of the Chemical Laboratory, Johns Hopkins University's original campus.

Candid photograph of Stewart at approximately 60 years old, writing at a stock room desk in the original Chemistry building, Johns Hopkins University's original campus.

Candid photograph of Stewart at approximately 60 years old, writing at a stock room desk in the original Chemistry building, Johns Hopkins University's original campus.

Candid photograph of Stewart at approximately 60 years old at a stock room desk in the original Chemistry building, Johns Hopkins University's original campus.

Candid photograph of Stewart at approximately 60 years old at a stock room desk in the original Chemistry building, Johns Hopkins University's original campus.

Portrait of Wilson at approximately 29 years old.

Portrait of White at approximately 64 years old.