Mark Barr, Date of Birth, Date of Death

Mark Barr

American mathematician

Date of Birth: 18-May-1871

Date of Death: 15-Dec-1950

Profession: mathematician, inventor

Nationality: United States

Zodiac Sign: Taurus

James Mark McGinnis Barr (May 18, 1871, Pennsylvania – December 15, 1950, The Bronx) was an electrical engineer, physicist, inventor, and polymath known for proposing the standard notation for the golden ratio.
Born in America, but with English citizenship, Barr lived in both London and New York City at different times of his life. Though remembered primarily for his contributions to abstract mathematics, Barr put much of his efforts over the years into the design of machines, including calculating machines.
He won a gold medal at the 1900 Paris Exposition Universelle for an extremely accurate engraving machine.