In
geophysics, he is best known for his explanations of the depth distribution of earthquakes, and for his direct (non-Magnitude-based) calculations of earthquake energy release. Vassiliou has also been cited for his experimental work on solids at high pressures and temperatures. In 2009, he published the
Historical Dictionary of the Petroleum Industry, which went into a Second Edition in 2018. In the broader field of
computational physics, Vassiliou is known for the introduction of Rokhlin's
fast multipole method to
computational electromagnetics. As an executive at the
Rockwell International Corporation, he was also well known as the leader of the U. S.
Army Research Laboratory's Advanced Displays Federated Laboratory Consortium in the late 1990s and early 2000s, making advances in the interaction of humans with displays. The work in
augmented reality included early development of the types of technologies that would later be applied to such platforms as
google glass. In later years, as an analyst advising the U.S. Government, he wrote influential papers on Command, Control, and Communications, including some with
David Alberts, and published the book
C2 Re-envisioned: the Future of the Enterprise, which has also been translated into Chinese. In 2022, Vassiliou, along with professor Mir-Yusif Mir-Babayev, published the book
US and Azerbaijani Oil in the Nineteenth Century: The Two Titans, which covers the early period of the petrochemical age, when the United States and Azerbaijan were responsible for 97% of the world's oil production. == References ==