Doctor Mole Incorporated
home services experience press contact

DuPont Circle Subway Tunnel Design


About Gary Brierley

aka "Doctor Mole"


Dr. Brierley began his career in 1968 with the Bachelor’s Degree in Civil Engineering from Tufts University and the Masters and Doctoral Degrees from the University of Illinois in 1970 and 1975, respectively. During that time Dr. Brierley was fortunate to work on the instrumentation program for DuPont Circle Subway Station in Washington, D.C.; a project that formed the basis for his doctoral dissertation. Since that time, Dr. Brierley has devoted his entire professional career to the design and construction management of underground openings.

Dr. Brierley has been involved with two successful start-up design practices; Brierley and Lyman and Brierley Associates. He has served as President of the American Underground Construction Association, Chairman of the Underground Technology Research Council, and as a member of the U.S. National Committee on Tunneling Technology. He is a member of several professional societies and has authored more than 200 technical papers and articles for tunneling publications including the “Ask Dr. Mole” column for TBM magazine.

A Brief History

2013 – Present

President, Doctor Mole Incorporated


1999 – 2012

President, Brierley Associates, LLC Denver, CO



Chairman, Expert Witness & Ethics Committee, ACEC Denver, CO


1991 to 1999

Director of Tunnel Design and Sr. Vice President, Haley & Aldrich, Inc. Boston, MA

1987 to 1991

President, Brierley & Lyman, Inc. Denver, CO


1984 to 1987

Vice President of Tunneling and Underground Construction, CRS Sirrine Houston, TX


1981 to 1984

Manager, Geotechnical Division of Stone & Webster Engineering Denver, CO


1975 to 1981

Office Manager and Vice President, Haley & Aldrich of New York Rochester, NY

Gary's Credentials


Ph.D., Civil Engineering, University of Illinois,. 1975

M.S., Civil Engineering, University of Illinois, 1970

B.S., Civil Engineering, Tufts University, 1968

Professional Registrations

Gary is a registered professional civil engineer in 29 states.

Professional Societies

American Counsel of Engineers Companies

American Society of Civil Engineers

Former President, American Underground Construction Assoc.

Former Chairman, Underground Technology Research Council

Former Member, U.S. National Committee on Tunneling Technology

Society of Mining Engineers

International Tunneling Association

Honorary Societies/Awards

Geotechnical Award, Boston Society of Civil Engineering ACEC 1974, 1975 and 1976

National Science Foundation Fellowship

1989 Kenneth S. Lane Award for excellence in publication.


 Doctor Mole Incorporated on LinkedIn  Join Gary's Mailing List


Doctor Mole Incorporated

990 S. Broadway

Suite 222

Denver, CO 80209

Office Phone 303.797.1728