Question: What is the birthdate of this American mixed martial artist, currently fighting in the welterweight division for the World Series of Fighting and who met up with Frank Gomez at San Francisco State College?
Context: Mats Nilsson (born December 5, 1983) is a Swedish grappler and retired mixed martial artist.  Nilsson formerly competed in the Welterweight division of the Ultimate Fighting Championship.  He is the three time FILA Grappling world champion in the -90 kg no-gi and -92 kg no-gi division and a two-time bronze medalist in FILA Grappling European Championship.  Nilsson holds a black belt in both Judo and Brazilian jiu-jitsu.  He is currently fighting out of Rumble Sports, Copenhagen, Denmark, while representing Kaisho Martial Arts, Helsingborg, Sweden in Grappling. Alexander Andreevich Yakovlev (Russian: Александр Андреевич (Магомедович) Яковлев; born July 18, 1984), also known as Sultan Tikhaev, is a Russian amateur wrestler, mixed martial artist and rapper.  Yakovlev is recognized as an aggressive welterweight competitor who competed in the M-1 Global, ProFC, Shooto Russia, and Bodog Fight promotions.  Yakovlev’s martial arts background included training in Sambo and Freestyle Wrestling prior to turning his attention to professional fighting at the age of nineteen.  He is currently fighting in the welterweight division for the Ultimate Fighting Championship. Steven Joseph "Steve" Carl (born December 20, 1984) is an American mixed martial artist.  A professional MMA competitor since 2005, Carl previously competed for Bellator from 2010 to 2011 and currently competes in the Welterweight division for the World Series of Fighting.  He is the former WSOF Welterweight Champion. The San Francisco State Gators football team represented San Francisco State University (formerly San Francisco State Teacher's College) from the 1931 through 1995 seasons.  The Gators originally competed as an independent prior to World War II, then as a member of the Far West Conference from 1946 until the conference changed its name to become the Northern California Athletic Conference, where they remained through the 1994 season.  San Francisco State played its home games at multiple stadiums throughout their history with the most recent being Cox Field in San Francisco.  San Francisco State was known as the "Cradle of Coaches", having produced coaching greats such as Mike Holmgren, Andy Reid, Bob Toledo, and many others. Dong Hyun Kim (Korean: 김동현, 金東炫 ; born November 17, 1981) is a South Korean mixed martial artist currently fighting in the UFC's welterweight division.  He was signed by the UFC after fighting in the Japanese promotion DEEP and in the South Korean promotion Spirit MC.  As of 9 August, 2017, he is #12 in official UFC welterweight rankings. Jake Sequoyah Shields (born January 9, 1979) is an American mixed martial artist, currently fighting in the welterweight division for the World Series of Fighting.  He was the last Rumble on the Rock Welterweight Champion, the only Elite XC Welterweight Champion, a former Shooto Welterweight Champion and former Strikeforce Middleweight Champion.  He also fought for the Ultimate Fighting Championship (UFC). Kyle James Bradley (born August 19, 1982) is an American mixed martial artist, who currently competes in the Welterweight division.  A professional mixed martial artist since 2003, Bradley is best known for his four fight stint with the Ultimate Fighting Championship.  He currently holds a record of 22–12 (1). Bryan Barberena (born May 3, 1989) is an American mixed martial artist currently fighting in the welterweight division in the Ultimate Fighting Championship. Melvin Paul Guillard, Jr. (born March 30, 1983) is an American mixed martial artist who competes in the Welterweight division.  Guillard most notably competed in the Lightweight division of the Ultimate Fighting Championship (UFC) where he went (12–9), Bellator MMA (Bellator) where is went (0–3 (1)) and World Series of Fighting (WSOF) where he went (1–1).  He debuted in the company on "The Ultimate Fighter 2" television series, losing to Josh Burkman by decision in the first Welterweight elimination bout.  Guillard currently holds the UFC record for most TKO/KO victories (eight) in the Lightweight division, surpassing the previous record held by Multi-Divisional Champion B.J. Penn with his knockout of Shane Roller at "UFC 132".  He again extended this record in his knockout victory over Mac Danzig at "". Frank Gomez (born March 31, 1986) is an American mixed martial artist.  He formally fought in the WEC's bantamweight division.  Gomez is from Albuquerque, New Mexico where he trains full-time with Jackson's Submission Fighting.  He got into MMA from wrestling at San Francisco State College where he met up with Gilbert Melendez and Jake Shields.
Answer: January 9, 1979