Professor Margeton earned his A.B. degree from Mount Saint Mary's College, Emmitsburg, Maryland, in 1967, his J.D. degree from George Washington University in 1970, and his master's degree in library science from The Catholic University of America in 1973. After serving for two years (1970-1972) as assistant reference librarian in the American-British Law Library Reading Room of the Library of Congress, he joined the firm of Steptoe & Johnson as their first full-time law librarian from 1972 through 1985. For a short time during this period he also held part-time positions of evening reference librarian at the American University Law Library (1976-1977) and legal research instructor at the George Mason University Law School (1977-1979).
In 1985, he was appointed Librarian of the Supreme Court of the United States, where he also served as a statutory officer of the court until 1988. He served as the director of the Judge Kathryn J. DuFour Law Library of the Columbus School of Law from 1988-2013.
Professor Margeton has been active over the years in the American Association of Law Libraries, working on various committees, as well as serving as its representative to the U.S. Congress Joint Committee on Printing (1983-1994). He is also a member of the Law Librarians Society of Washington, D.C. and was president of the society from 1996-1997.
Introduction to Design for Law and Other Academic Libraries: Reflection and Change. 2nd Buffalo: William S. Hein & Co., Inc., 2007.
Introduction to Academic Law Library Design: A Features Approach. Littleton, Co.: Fred B. Rothman Publications, 2000.
Law Library Preservation Issues: Books, Microforms and Electronic Media. Law Library Information Reports, No. 16. Dobbs Ferry, N.Y.: Glanville Publishers, 1994 (with Willis C. Meredith).
"The Value of Experiential Learning in Law Librarianship Education." In The Spirit of Law Librarianship, 2nd, edited by Roy M. Mersky and Richard A. Leiter. Chicago: Alert Publications, 2005.
"Continuing Education for Law Librarianship." In The Spirit of Law Librarianship: A Reader, edited by Roy M. Mersky and Richard A. Leiter. Littleton, Colo.: Rothman, 1991 (with Laura Gasaway).
"Equipping the Library - The Physical Equipment." in The Private Law Firm Library: Integral Tool of the Law Firm (Course Handbook). New York: Practising Law Institute, 1977.
"New Developments in Information Technology." in The Private Law Firm Library: Integral Tool of the Law Firm (Course Handbook). New York: Practising Law Institute, 1977.
"Law Library Design Bookshelf-An Annotated Bibliography." Law Library Journal 97, no.1 (2005): 77.
"Paraprofessionals: Surpassing the Grade." AALL Spectrum 3, no. 7. (1999): 8.
"Alma Mater Mentoring: Library Science Alumni Promote School and Profession." Journal of Education in Library and Information Science 36 (Fall 1995): 346 (with Pamela Dragovich).
"Catholic University's Law Library Emphasizes Space, Style and Technology." New Library World 96, no. 1119 (1995): 4.
"Of Legislative Histories and Librarians." Law Library Journal 85 (Winter 1993): 81.
"Introduction to Concept Through Construction: Mastering the Art of Law Library Design." Law Library Journal 79 (Summer 1987): 485.
"Plethora of Research Tools for Energy Lawyers." Legal Times of Washington I, no. 39 (1979): 8.
"Documents of the Federal Trade Commission." Law Library Journal 66 (1976): 66.
"Law, Legislative History, and the Librarian." In Encyclopedia of Library and Information Science, Volume 60, edited by Allen Kent. New York: Marcel Dekker, Inc., 1997: 134.
A Century Of Scholarship: Faculty Publications 1897-1997. Washington, D.C.: Columbus School of Law, 1999 (co-edited with Patrick Petit).