The lack of modern development on the site makes it possible for extensive archaeological investigations.  In addition to the recent geophysical surveys by Dr. Lockyear and his crew, the site has been excavated numerous times since its rediscovery.  But there were two major excavations at the site: the first in the 1930s under R.E.M. Wheeler and Tessa Verney Wheeler, and the second in the 1950s under Sheppard S. Frere.  These excavations gave us most of our current knowledge about Verulamium including the town’s layout.  This layout includes a forum, theatre of the Gallo-Roman type, fragments of the town wall, market hall, two triumphal arches, and a variety of houses and shops.So how did we get artifacts from Verulamium?  They were donated in 1934 by Dr. Harvey Walker (1900-1971), a professor and head of the political science department at Ohio State University.  Walker is most well-known for his proposal of a one house legislature in Ohio.  He also wrote a book entitled Training Public Employees in Great Britain (1934).  How or when these artifacts came into Walker’s possession is unknown, but perhaps it had to do with the publication of the Public Employees book which is about Britain.