GreyCastle Security

Brief Overview

GreyCastle Security is a service provider dedicated exclusively to cybersecurity and the practical management of cybersecurity risks.


Troy, NY
500 Federal Street
Suite 540
Troy, NY 12180
(518) 274-7233


Reg Harnish serves as CEO of GreyCastle Security.
Dan Kali serves as Chief Strategy Officer of GreyCastle Security.


The company was founded in 2011 and is based in Troy, New York with additional location in Rochester, New York and remote locations in Minneapolis, Minnesota; Detroit, Michigan; San Francisco, California; Chicago, Illinois; and Philadelphia, Pennsylvania. GreyCastle Security, LLC operates as a subsidiary of Assured Information Security, Inc.

Key Competitors

Fortalice, GLS

Products and Services

The company provides risk assessment, incident response, compliance, awareness, governance, penetration testing, and vulnerability assessment services, as well as ISO-as-a-service. It serves businesses in healthcare, higher education, retail, utilities, financial, and technology industries in North America