Member Services
For questions about membership, renewal, or updating your contact information, complete this form and our Member Services team will follow up with you.

Phone:  888.634.7575 (US/Canada toll-free)  or +1.317.634.8171 (International)

Fax Number:  +1.317.634.8188 (International) 

Mailing Address
Sigma
550 W. North St.
Indianapolis, IN 46202
USA

Media Inquiries
Julie Adams, Director of Marketing and Communications