Gregg William Bergersen (born 1956/57) was a weapons systems policy analyst for the United States Defense Security Cooperation Agency. A director of C4ISR programs, he was found guilty of spying for the People's Republic of China. A resident of Alexandria, Virginia, he sold classified defense information to Tai Kuo, a naturalized citizen originally from Taiwan, who was a New Orleans furniture salesman. Kuo then forwarded the information to the PRC government. The data outlined all planned sales of weapons and military technology to Taiwan for the next five years. Bergersen was sentenced to 57 months of confinement.