 Alexander also was professor of civil engineering at the University of Pennsylvania and professor of physics at the University of Maryland.He published a number of works including his report on a new map of Maryland (1835), a treatise on international coinage of Great Britain and the United States (1857) and an opinion on the location of the Baltimore and Ohio Railroad in Wheeling, Virginia (1850).He edited a treatise on leveling and Sims' treatise on mathematical instruments (1838), used in surveying, leveling, and astronomy (1835).