Joyce Kathleen Reynolds (March 8, 1952 – December 28, 2015) was an American computer scientist who played a significant role in developing protocols underlying the Internet. She authored or co-authored many RFCs, most notably those introducing and specifying the Telnet, FTP, and POP protocols.
Reynolds held bachelor's and master's degrees in social sciences from the University of Southern California.
From 1983 until 1998, she worked with Jon Postel to develop early functions of the Internet Assigned Numbers Authority, such as the global allocation of IP addresses, Autonomous System (AS) number allocation, and management of the root zone of the Domain Name System (DNS). After Postel's death in 1998, Reynolds helped supervise the transition of the IANA functions to the Internet Corporation for Assigned Names and Numbers. She worked with ICANN in this role until 2001, while remaining an employee of ISI.
From 1987 to 2006, she served on the editorial t