Robert C. Armstrong, the Chevron Professor of Chemical Engineering who has been the director of the MIT Energy Initiative (MITEI) since 2013 and part of MITEI’s leadership team since its inception in 2007, has announced that he will retire effective June 30. At that time he will have completed 50 years on the MIT faculty. Armstrong plans to continue to work at 10 percent capacity, focusing on research projects on which he serves as principal investigator and also advising a number of graduate students. “Working at MIT has been a…