General Inquiries
Corporate Headquarters
ManTech International Corporation
2251 Corporate Park Drive
Herndon, VA 20171
Phone: (703) 218-6000
Small Business Office
Deborah Jackson-Hamilton
Email: [email protected]
Media Inquiries
Jim Crawford, Executive Director – Media Relations
Phone: (571) 446-7550
GSA and GWAC Inquiries
Employment Verifications
Thomas & Company
Website: https://tncverify.com
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
Phone: (855) 849-6020
Email: [email protected]
Other Human Resource Questions:
Current ManTech Employees: Submit a request via https://servicenow.mantech.com/
Former ManTech Employees: Call 1-877-996-4248 and choose “HR” for 401k, benefits, and other inquiries