Question: In which county is the university, at which Roger Groot was the Class of 1975 Alumni Professor of Law, located?

<P0-S0> Washington and Lee University (Washington and Lee or W&L) is a private liberal arts university in Lexington, Virginia, (Rockbridge County) of the United States. <SEP> <P1-S0> Anthony Clark Arend (born October 24, 1958) is Professor of Government and Foreign Service at Georgetown University. <P1-S1>  On August 1, 2015, he became Senior Associate Dean for Graduate and Faculty Affairs in the Walsh School of Foreign Service at Georgetown University. <P1-S2>  He served as Director of the Master of Science in Foreign Service Program at the Walsh School from 2008-2017. <P1-S3>  With Christopher C. Joyner, he founded the Institute for International Law and Politics (now called the Institute for Law, Science and Global Security) at Georgetown University and served as co-director of the Institute from 2003-2008. <P1-S4>  He is also an adjunct professor of law at the Georgetown University Law Center. <P1-S5>  From 2005-2009, he edited the blog, Exploring International Law. <P1-S6>  His blog can now be found at the website AnthonyClarkArend.com He is a member of the Council on Foreign Relations. <P1-S7>  In April 2017, Arend received the John Carroll Award from the Georgetown University Alumni Association. <P1-S8>  This award "is conferred upon Georgetown alumni whose achievements and record of service exemplify the ideals and traditions of Georgetown and its founder" and is the highest honor given by the Alumni Association. <SEP> <P2-S0> Bankole A. Johnson, DSc, MD, MPhil, FRCPsych (born 5 November 1959) is a licensed physician and board-certified psychiatrist throughout Europe and the United States who served as Alumni Professor and Chairman of the Department of Psychiatry and Neurobehavioral Sciences at the University of Virginia. <P2-S1>  Johnson's primary area of research expertise is the psychopharmacology of medications for treating addictions, and he is well known in the field for his discovery that topiramate, a gamma-aminobutyric acid (GABA) facilitator and glutamate antagonist, is an effective treatment for alcoholism. <P2-S2>  Professor Johnson also received national media attention for his appearance in the Home Box Office (HBO) original documentary feature, "Addiction", which won the prestigious Governors Award, a special Emmy Award, from the Academy of Television Arts and Sciences. <P2-S3>  Professor Johnson recently accepted an appointment to join the University of Maryland as the Chairman of Psychiatry and to lead a Brain Science Research Consortium in the neurosciences. <SEP> <P3-S0> Roger Douglas Groot (1942–2005) was the Class of 1975 Alumni Professor of Law at Washington and Lee University School of Law in Lexington, Virginia, where he had taught since 1973. <P3-S1>  Prior to graduating law school, he'd served six years in the United States Marine Corps, including a tour in Vietnam as an advisor to the Army of the Republic of Vietnam. <P3-S2>  He was an expert in criminal law and procedure, and the death penalty. <P3-S3>  Groot had been appointed counsel in several Virginia capital cases, appointed as defense legal analyst in federal death penalty cases, and consulted in several hundred capital cases, including Lee Boyd Malvo (Beltway Sniper) and Peter Odighizuwa (Appalachian School of Law shooting). <P3-S4>  At the time of Groot's death, none of his clients had been sent to death row.