Question: In what year was the physicist of whom Erwin Finlay-Freundlich was a working associate born?

Context articles: Ed Peranio
Son Bonds
Erwin Huang
Erwin Finlay-Freundlich
Einstein Tower
Andrew Gemant
Karl Gehlen
Joan Hinton
Albert Einstein
Little Buddy Doyle

Ed Peranio is an American film actor and associate production designer, working primarily in the films of John Waters.
 Because of his work with Waters, he is considered one of the Dreamlanders, Waters' ensemble of regular cast and crew members.
 Peranio is the brother and working associate of production/art designer Vincent Peranio.
Abraham John Bond Jr., known as Son Bonds (March 16, 1909 – August 31, 1947), was an American country blues guitarist, singer and songwriter.
 He was a working associate of Sleepy John Estes and Hammie Nixon.
 He was similar to Estes in his guitar-playing style.
 According to the music journalist Jim O'Neal, "the music to one of Bonds's songs, 'Back and Side Blues' (1934), became a standard blues melody when Sonny Boy Williamson I, from nearby Jackson, Tennessee, used it in his classic "Good Morning, School Girl".
 The best-known of Bonds's other works are "A Hard Pill to Swallow" and "Come Back Home."
Erwin Huang (黃岳永, born 1965) is a pioneer in bringing technology to education and social enterprise.
 He is well known for his participation in the TV reality show where the Silicon Valley-trained expert and CEO of a listed company lived a in crummy subdivided apartment in Shum Shui Po, Hong Kong, earning 50 HKD per day.
 This experience had significantly changed Erwin’s view towards life, motivating him to actively engaging in social entrepreneurship and helping the underprivileged groups via social innovations and information technology.
 In 2016, Erwin has accepted the invitation from The Hong Kong University of Science and Technology (HKUST) to be appointed as Adjunct Professor of Information Systems, Business Statistics and Operations Management in School of Business, Associate Professor of Engineering Practice in School of Engineering, and Senior Advisor of Centre for Education Innovation in Entrepreneurship.
 His mission is to teach Social Innovation and Entrepreneurship to university students and to let more young generations understand entrepreneurial spirit, identify social issues, as well as creating social impact through innovations.
Erwin Finlay-Freundlich FRSE FRAS (] ; 29 May 1885 – 24 July 1964) was a German astronomer, a pupil of Felix Klein.
 Freundlich was a working associate of Albert Einstein and introduced experiments for which the general theory of relativity could be tested by astronomical observations based on the gravitational redshift.
The Einstein Tower (German: "Einsteinturm") is an astrophysical observatory in the Albert Einstein Science Park in Potsdam, Germany built by Erich Mendelsohn.
 It was built on the summit of the Potsdam "Telegraphenberg" to house a solar telescope designed by the astronomer Erwin Finlay-Freundlich.
 The telescope supports experiments and observations to validate (or disprove) Albert Einstein's relativity theory.
 The building was first conceived around 1917, built from 1919 to 1921 after a fund-raising drive, and became operational in 1924.
 Although Einstein never worked there, he supported the construction and operation of the telescope.
 It is still a working solar observatory today as part of the Leibniz Institute for Astrophysics Potsdam.
 Light from the telescope is directed down through the shaft to the basement where the instruments and laboratory are located.
 There were more than half a dozen telescopes in the laboratory.
Andrew Gemant (1895–1983) was a renowned physicist, remembered in part by the eponymous Andrew Gemant Award.
 His work included a series of fundamental papers on viscoelasticity and fractional differentials, published in the mid 20th Century.
 Andrew Gemant was born in Nagyvarad, Hungary on July 27, 1895.
 He served in the Austro-Hungarian army as a medical student during the World War I and received his M.D. from the University of Budapest in 1919.
 During 1920-1922 he attended the University of Berlin and worked in the laboratories of Leonor Michaelis and Herbert Freundlich.
 He received his Ph.D. in physics in 1922.
 From 1923-1924, Gemant was a research physicist at Radiologie Inc, an X-ray tube manufacturer in Berlin.
 From 1925-1931 he was a research physicist at Siemens-Schuckert Cable Company.
 He held a privat-docent position at the Technical University of Berlin (Technische Universität Berlin) from 1929-1933, and from 1932-1933 he was a researcher at the Heinrich Hertz Institute (HHI) for Research on Oscillations.
 In 1933 Gemant was dismissed from his research and teaching positions by the National Socialist (Nazi) government.
 He and his wife Susi (Sophia Ida Marie), whom he had recently married, subsequently left Germany for England, and from 1934-1937 Gemant was a research associate in the Engineering Laboratory of Oxford University.
 The Gemants then moved to the United States, where from 1938-1939 he was a research associate in the Electrical Engineering Department at the University of Wisconsin.
 From 1940-1960 Gemant was a staff physicist at the Detroit Edison Company.
 He subsequently held positions as a research associate at Grace Hospital in Detroit, Michigan from 1961-1971 and in Wayne State University's Department of Biochemistry from 1972-1983.
 He died in February 1983 at the age of 87.
Karl Gehlen was the chief designer of the German Flugzeugbau Friedrichshafen GmbH company, formed on June 17, 1912 by Diplom Ingenieur Theodor Kober, a working associate of Graf Ferdinand von Zeppelin.
Joan Chase Hinton (Chinese name: 寒春, Pinyin: "Hán Chūn"; 20 October 1921 – 8 June 2010) was a nuclear physicist and one of the few women scientists who worked for the Manhattan Project in Los Alamos.
 She lived in the People's Republic of China after 1949, where she and her husband Erwin (Sid) Engst participated in China’s efforts at developing a socialist economy, working extensively in agriculture.
 She lived on a dairy farm north of Beijing before her death on June 8, 2010.
Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist.
 Einstein developed the theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics).
 Einstein's work is also known for its influence on the philosophy of science.
 Einstein is best known by the general public for his mass–energy equivalence formula "E" = "mc" (which has been dubbed "the world's most famous equation").
 He received the 1921 Nobel Prize in Physics "for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect", a pivotal step in the evolution of quantum theory.
Little Buddy Doyle (born March 20, 1911; died c. 1960) was an American Memphis blues and country blues guitarist, singer and songwriter.
 He was a working associate of the harmonica players Big Walter Horton and Hammie Nixon, the guitarist David "Honeyboy" Edwards, and the pianist Sunnyland Slim.