General Inquiries

Corporate Headquarters 
ManTech International Corporation 
2251 Corporate Park Drive
Herndon, VA 20171
Phone: (703) 218-6000 ​​

Small Business Office

Email: [email protected]

Media Inquiries

Jim Crawford, Executive Director – Media Relations
Phone: (571) 446-7550

GSA and GWAC Inquiries

[email protected]

Employment Verifications

Thomas & Company
Phone: (615) 620-0569
Email: [email protected]
Government Investigators: Please contact HR Customer Support at 866-793-MTHR (6847) or email: [email protected]


Careers/Employment Inquiries

Email: [email protected]

Other Human Resource Questions:

Current ManTech Employees: Submit a request via
Former ManTech Employees: Call 1-877-996-4248 and choose “HR” for 401k, benefits, and other inquiries