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Both Wood and Pfund left Wisconsin for Johns Hopkins in 1903. From 1903 to 1905 Pfund was a Carnegie research assistant and continued to work under Wood. In 1906 Pfund earned his Ph.D. in physics and was a Johnston scholar from 1907 to 1909. He remained at Hopkins for the remainder of his career, eventually becoming a full professor and later chair of the physics department. From 1943 to 1944 Pfund served as the president of the [[Optical Society of America]].
Within the [[hydrogen spectral series]] Pfund discovered the fifth series, where an electron jumps up from or drops down to the fifth fundamental level. This Series is known as the [[hydrogen spectral series#Series|Pfund series]], named for him. He also invented the [[Pfund telescope]], which is a method for achieving a fixed telescope focal point regardless of where the telescope line of sight is positioned, and the [[Pfund sky compass]],<ref>[http://www.ion.org/publications/abstract.cfm?articleID=102101/ Moody, Lieutenant Commander Alton B., ''"THE PFUND SKY COMPASS",'' NAVIGATION, Journal of The Institute of Navigation, Vol. 2, No. 7, 1950]</ref>
==See also==
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