atsec has always been heavily involved in shaping the future of emerging and established IT security standards and practices. As a part of this we seek exchange with our peers in the IT security field.
Here is a selection of the organizations that atsec is associated with:

Common Criteria Users Forum (CCUF)
Cryptographic Module User Forum (CMUF)
INCITS CS1 Cyber Security (US ISO/IEC JTC 1/SC27 Shadow)

atsec colleagues are also members of these organizations:
IEEE Computer Society
ISSA (Information Systems Security Association)

PMI (Project Management Institute)

OWASP (Open Web Application Security Project)