Looking for Peering Contact at AS16509

Hi, I'm trying to connect with someone responsible for managing North American IXP at AS16509. Greatly appreciate if an appropriate contact could kindly reach out to me off-list. Previously have attempted to reach out via the email address(peering-amer@amazon.com) listed on peering.aws website on two occasions but haven’t been successful in establishing contact. Kind Regards, Xinhao Luo