Édouard Guillaume (1881–1959) was a Swiss physicist and patent examiner, notorious for his published papers attacking Albert Einstein's theory of special relativity.
Beginning in 1913 Guillaume began publishing in the Archives des Sciences Physiques et Naturelles papers arguing for a Lorentzian electrodynamics with a universal time.
Their models were intensively discussed by the X-Crise group in Paris, and exerted an influence on the early French contributions to mathematical economics and econometrics.
In addition, the Guillaume brothers ... created their own research institute in Paris, which applied their models to real world issues and offered its services to the private sector.
[5] In 1932 he was an Invited Speaker of the ICM in 1932 in Zurich, where he gave a talk stemming from the Guillaume brothers' work on mathematical economics.