William Hallock, Ph. D., D.Pharm. (1857-1913) was an American

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 physicist, born at Milton, New York

Milton, New York

Milton, New York can refer to the following places in New York:*Milton , New York - a town in Saratoga County**Milton , Saratoga County, New York - a census-designated place in the town of Milton...

.

He graduated from Columbia College

Columbia College of Columbia University

Columbia College is the oldest undergraduate college at Columbia University, situated on the university's main campus in Morningside Heights in the borough of Manhattan in New York City. It was founded in 1754 by the Church of England as King's College, receiving a Royal Charter from King George II...

 in 1879, and received the degree of Ph.D. from Würzburg

Würzburg

Würzburg is a city in the region of Franconia which lies in the northern tip of Bavaria, Germany. Located at the Main River, it is the capital of the Regierungsbezirk Lower Franconia. The regional dialect is Franconian....

, Germany

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

 in 1881.

He served as professor of chemistry and toxicology at the National College of Pharmacy in 1889-92, and as physicist of the United States Geological Survey

United States Geological Survey

The United States Geological Survey is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization has four major science disciplines, concerning biology,...

 from 1882 to 1891, then returned to Columbia

Columbia University

Columbia University in the City of New York is a private, Ivy League university in Manhattan, New York City. Columbia is the oldest institution of higher learning in the state of New York, the fifth oldest in the United States, and one of the country's nine Colonial Colleges founded before the...

 as adjunct professor of physics in 1892.

He became full professor in 1902 and was dean

Dean (education)

In academic administration, a dean is a person with significant authority over a specific academic unit, or over a specific area of concern, or both...

 of the faculty of pure science (1906-09).

Professor Hallock wrote Outlines of the Evolution of Weights and Measures and the Metric System (1906).