Question: When did the person that helped van Vleck develop CFT die?

Context articles: Van Vleck (crater)
Starrett &amp; van Vleck
Crystal field theory
Van Vleck Independent School District
Van Vleck High School
Henry Seely White
Van Vleck House and Gardens
Van Vleck Observatory
Hans Bethe
Van Vleck, Texas

Van Vleck is a lunar impact crater that is located near the northeastern rim of the walled plain Gilbert, to the west of the Mare Smythii.
 The similar crater Weierstrass is nearly joined to the northwestern rim of Van Vleck.
 To the east is the small Carrillo.
The architectural firm of Starrett & van Vleck, often spelled Starrett & Van Vleck, specialized in the design of early 20th century department stores primarily in New York City.
 The partner Goldwin Starrett, brother of Colonel William A. Starrett, had worked for four years in the Chicago office of Daniel Burnham.
 Included in their designs were the New York City flagship stores of Lord & Taylor, Bloomingdales, Saks Fifth Avenue, Abraham & Straus, and Alexander's.
 The Lord and Taylor store, located on Fifth Avenue between 38th and 39th streets, was completed in 1914 and was Starrett & van Vleck’s first major department store.
 In December 2007, the store was named a New York City landmark.
Crystal Field Theory (CFT) is a model that describes the breaking of degeneracies of electron orbital states, usually d or f orbitals, due to a static electric field produced by a surrounding charge distribution (anion neighbors).
 This theory has been used to describe various spectroscopies of transition metal coordination complexes, in particular optical spectra (colors).
 CFT successfully accounts for some magnetic properties, colours, hydration enthalpies, and spinel structures of transition metal complexes, but it does not attempt to describe bonding.
 CFT was developed by physicists Hans Bethe and John Hasbrouck van Vleck in the 1930s.
 CFT was subsequently combined with molecular orbital theory to form the more realistic and complex ligand field theory (LFT), which delivers insight into the process of chemical bonding in transition metal complexes.
Van Vleck Independent School District is a public school district based in the community of Van Vleck in unincorporated Matagorda County, Texas (USA).
 The superintendent is John O'Brien.
Van Vleck High School is a public high school located in the city of Van Vleck, Texas, in Matagorda County, United States and classified as a 2A school by the UIL.
 It is a part of the Van Vleck Independent School District located in northeast Matagorda County.
 In 2013, the school was rated "Met Standard" by the Texas Education Agency.
Henry Seely White (May 20, 1861 – May 20, 1943) was an American mathematician.
 He was born in Cazenovia, New York to parents Aaron White and Isadore Maria Haight.
 He matriculated at Wesleyan University in Connecticut and graduated with honors in 1882 at the age of twenty-one.
 White excelled at Wesleyan in astronomy, ethics, Latin, logic, mathematics, and philosophy.
 At the university, John Monroe Van Vleck taught White mathematics and astronomy.
 Later, Van Vleck persuaded White to continue to study mathematics at the graduate level.
 Subsequently, White studied at the University of Göttingen under Klein, and received his doctorate in 1891.
Van Vleck House and Gardens, a former private estate by the eponymous family, is a non-profit community resource in Montclair in Essex County, New Jersey, United States, that displays a public botanical garden of mostly ericaceous plants that has been developed over several generations.
 The display of rhododendrons and azaleas shows numerous hybrids, several named after members of the Van Vleck family.
Van Vleck Observatory (VVO, IAU code 298) is an astronomical observatory owned and operated by Wesleyan University.
 It was built in 1914 and named after the former head of the Department of Mathematics and Astronomy at the university, Prof. John M. Van Vleck.
 It is located in Middletown, Connecticut (USA).
Hans Albrecht Bethe (] ; July 2, 1906 – March 6, 2005) was a German and American nuclear physicist who, in addition to making important contributions to astrophysics, quantum electrodynamics and solid-state physics, won the 1967 Nobel Prize in Physics for his work on the theory of stellar nucleosynthesis.
Van Vleck is a census-designated place (CDP) in Matagorda County, Texas, United States.
 The population is one of the few areas with positive growth in Matagorda County.
 The 2010 census showed a 25% increase with 1,844 people (versus 1,411 at the 2000 census).
 Although near Bay City, TX the site of Van Vleck falls outside the ETJ of Bay City, TX and is regulated by county police and county ordinance.