- Texas Offices - Jack Sigler, Principal jsigler@securityaccessdesign.com Phone: (972) 245-3737 Fax: (972) 323-9092 Sheila Sigler, Principal ssigler@securityaccessdesign.com Phone: (972) 245-3838 Security Access Design Group, LLC 2917 Mesquite Drive Carrollton, Texas 75007 Please send Jack Sigler an e-mail for information