Jay Dee "B.J." Penn (born December 13, 1978) is an American professional mixed martial artist and Brazilian Jiu-Jitsu practitioner.
 Penn debuted and competed in the Ultimate Fighting Championship (UFC), and later in K-1.
 Prior to fighting for the UFC, he became the first American Gold medalist of the World Jiu-Jitsu Championship.
 In mixed martial arts, Penn has competed in the Featherweight, Lightweight, Welterweight, and Middleweight divisions.
 As a former UFC Lightweight Champion and UFC Welterweight Champion, he is one of only three fighters in UFC history to win titles in multiple weight classes.
 Penn was also a Co-champion in the UFC 41 Lightweight Tournament, due to an eventual draw opposite Caol Uno in the tournament finale.
 Through his tenures as champion, Penn unofficially unified the UFC Lightweight Championship (against Sean Sherk) and broke the all-time lightweight title defense record.
 Penn was inducted into the UFC Hall of Fame, as the inaugural inductee in the Modern-Era Wing by career-long rival Matt Hughes, during "International Fight Week" in July 2015.
Gerald Strebendt is a mixed martial artist, having competed in MMA organisations such as the UFC and Cage Rage.
 The highlight of Gerald's career was at UFC 44, where he took on top lightweight, Josh Thomson - losing in the first round by KO.
 Despite losing, Gerald showed an aggressive grappling style in his match, living up to his name "The Finishing Machine" - A name that has stood by him for his entire MMA career, where he has never gone to a decision, win or lose.
The Khalid Bin Hamad Al Khalifa Mixed Martial Arts (KHK MMA) is a martial arts organization based in Bahrain.
 It was founded under the patronage of His Highness Khalid bin Hamad Al Khalifa for its current CEO and professional MMA fighter Mohammed "The Hawk" Shahid in February 2015.
 Fighters competing under KHK MMA banner include: former UFC lightweight champion Frankie Edgar, UFC lightweight contender Khabib Nurmagomedov, UFC lightweight fighter Islam Makhachev, Bellator fighter James Gallagher, 2-time IMMAF champion Jose "Shorty" Torres, former UFC fighter and current Titan FC contender Alex Soto, and current Desert Force fighter Hamza Kooheji.
 KHK MMA activities include: coaching pro fighters, developing amateur MMA, promoting martial arts events, fitness gyms, and a sports gear brand.
Joshua Joseph Thomson (born September 21, 1978) is an American mixed martial artist who currently competes in Bellator MMA's lightweight division.
 A professional competitor since 2001, Thomson has also competed in PRIDE, Strikeforce, UFC, the World Fighting Alliance, and appeared at Dynamite!!
 2010.
 Thomson is a former Strikeforce World Lightweight Champion and a former Strikeforce U.S. Lightweight Champion.
Anthony Paul Pettis (born January 27, 1987) is an American mixed martial artist currently competing as a Lightweight in the Ultimate Fighting Championship (UFC), where he is the former UFC Lightweight Champion.
 Pettis was also the final WEC Lightweight Champion prior to the promotion being merged into the UFC.
 At one point, he was ranked as a top-ten pound for pound fighter.
 He is currently ranked #13 in the official UFC lightweight rankings.
Kaoru "Caol" Uno (宇野薫 , Uno Kaoru ) (born May 8, 1975) is a Japanese mixed martial artist.
 He is the Co-Champion of the UFC 41 Lightweight Tournament and a former Shooto Lightweight Champion.
 As one of the early Ultimate Fighting Championship's elite Lightweight competitors, Uno competed for the UFC Lightweight Championship on two separate occasions.
 Despite falling short in both championship bouts; losing a five-round decision against Jens Pulver at UFC 30, to determine the inaugural UFC Lightweight Champion as well as a draw against B.J. Penn at UFC 41 (in a bout which would have determined the new UFC Lightweight Champion and UFC 41 Lightweight Tournament Winner), Uno is acknowledged as a pioneer for his impact and influence during the early era of the UFC Lightweight Division.
Joseph Christopher Stevenson (born June 15, 1982) is an American mixed martial artist fighting out of Hesperia, California.
 Coached by (UFC Hall of Famer) Matt Hughes, Stevenson rose to prominence by becoming The Ultimate Fighter 2 Welterweight Tournament Winner.
 Following a drop in weight class and two-year undefeated streak, he was ranked among the top UFC Lightweight competitors, culminating into a title shot for the vacant UFC Lightweight Championship against B.J. Penn at "UFC 80: Rapid Fire" (after the title was stripped from Sean Sherk).
 Stevenson fought most of his career as a Lightweight and made his Featherweight debut at "".
 He is the former King of the Cage Lightweight Champion.
Edwin Stanton Dewees (born August 7, 1982 in Florence, South Carolina) is an American mixed martial artist.
 He was featured on "The Ultimate Fighter 4".
 His official UFC record is 0–3, losing matches to Rich Franklin at UFC 44 by TKO, Chris Leben at UFC Ultimate Fight Night 2 by armbar, and Jorge Rivera at The Ultimate Fighter 4 finale by TKO.
UFC 44: Undisputed was a mixed martial arts event held by the Ultimate Fighting Championship on September 26, 2003, at the Mandalay Bay Events Center on the Las Vegas, Nevada.
 The event was broadcast live on pay-per-view in the United States, and later released on DVD.
Jens Johnnie Pulver (born December 6, 1974) is an American professional mixed martial artist and undefeated boxer and kickboxer.
 Pulver was the inaugural UFC Lightweight Champion in addition to serving as the head coach on "The Ultimate Fighter 5" reality show against long-time rival B.J. Penn.
 In mixed martial arts, Pulver competed at the Lightweight, Featherweight, Bantamweight and Flyweight divisions in addition to competing at the Middleweight, Light Middleweight, and Welterweight divisions as a professional boxer.
 While perhaps best known for competing in the UFC, Pulver has also competed in Pride Fighting Championships, for the PRIDE 2005 Lightweight Grand Prix.
 He is to-date the youngest UFC Lightweight Champion in the UFC history, eventually relinquishing his title, after two defenses, due to a contract dispute.
 Pulver officially retired from combat sports in 2014.
 Pulver is considered the founder of the UFC lightweight division.

Question: What is the birthday of Gerald Strebendt's UFC 44 lightweight opponent?
Answer: September 21, 1978