Jane Siegel has been a criminal trial advocate since 1975. She owns her own private criminal defense firm in San Diego, California. Before opening her own office, she spent 24 years in the United States Marine Corps as a judge advocate and retired as a full colonel. Colonel Siegel has practiced as both a prosecutor and a judge, although her heart is ever in defense. She has tried in excess of 400 felony jury trials.
As a teacher of advocacy, the National Institute for Trial Advocacy certified Colonel Siegel as an instructor in 1985. She has taught trial advocacy for the Navy and the Marine Corps lawyers all over the world. Additionally, Colonel Siegel has taught advocacy for law schools and law firms all over the country, including Stanford, the University of San Francisco, Cardozo, California Western School of Law, and she is currently teaching at Thomas Jefferson School of Law. She teaches at the National College of Defense Counsel in Macon, Georgia and was the Executive Director of the Institute for Criminal Defense Advocacy in San Diego for 4 years.