Answer the question at the end by quoting:

Daniel Lee Dierdorf (born June 29, 1949) is a former American football offensive lineman and current sportscaster. A native of Canton, Ohio, Dierdorf played college football for the University of Michigan from 1968 to 1970 and was selected as a consensus first-team All-American in 1970 and a first-team All-Big Ten Conference player in 1969 and 1970. He was inducted into the University of Michigan Athletic Hall of Honor in 1996 and the College Football Hall of Fame in 2000. Dierdorf played professional football in National Football League (NFL) with the St. Louis Cardinals for 13 seasons from 1971 to 1983.
On September 9, 1979, Dierforf sustained torn ligaments in his left knee during an extra point attempt in the second quarter of the second game of the season against the New York Giants. After the game, Dierdorf said, "The knee was completely out of the socket. It moved a couple of inches off to the side. My leg was all twisted around and my foot was pointing in the wrong direction. It was painful. Very painful." Dierdorf was carried off the field on a stretcher, underwent knee surgery, and missed the remainder of the 1979 season. Dierdorf returned to the Cardinals in 1980, starting all 16 games for the team at right tackle in both the 1980 and 1981 seasons. In 1980, he was selected to play in the Pro Bowl and was selected as a first-team All-NFL player by the NEA. In 1982, Dierdorf moved to center and was the starter at that position for all nine games in a strike-shortened season. In 1983, Dierdorf returned to his right tackle position and appeared in seven games, only four as a starter. On October 11, 1983, after the Cardinals began the season with a 1-5 record, Dierdorf announced that he would retire at the end of the 1983 season. At the press conference announcing his retirement, Dierdorf said, "This was an easy decision for me to make. . . . Physically, I just can't play the type of game I want to." He added: "Ninety-five percent of me is sad that I'm retiring, but my knees are very, very happy."

Did he play any other positions?

In 1982, Dierdorf moved to center and was the starter at that position for all nine games

Some context: Victor Jara was born in 1932 in Lonquen, near Santiago, to two peasants, Manuel Jara and Amanda Martinez. His father was illiterate and encouraged his children to work from an early age to help the family survive, rather than attend school. By the age of 6, Jara was already working on the land. His father could not support the family on his earnings as a peasant at the Ruiz-Tagle estate, nor was he able to find stable work.
After joining the choir at the University of Chile in Santiago, Jara was convinced by a choir-mate to pursue a career in theater. He subsequently joined the university's theater program and earned a scholarship for talent. He appeared in several of the university's plays, gravitating toward those with social themes, such as Russian playwright Maxim Gorky's The Lower Depths, a depiction of the hardships of lower-class life. In 1957, he met Violeta Parra, a singer who had steered folk music in Chile away from the rote reproduction of rural materials toward modern song composition rooted in traditional forms, and who had established musical community centers called penas to incorporate folk music into the everyday life of modern Chileans. Jara absorbed these lessons and began singing with a group called Cuncumen, with whom he continued his explorations of Chile's traditional music. He was deeply influenced by the folk music of Chile and other Latin American countries, and by artists such as Parra, Atahualpa Yupanqui, and the poet Pablo Neruda. In the 1960s, Jara started specializing in folk music and sang at Santiago's La Pena de Los Parra, owned by Angel Parra. Through these activities, he became involved in the Nueva Cancion movement of Latin American folk music. He released his first album, Canto a lo humano, in 1966, and by 1970, he had left his theater work in favor of a career in music. His songs were inspired by a combination of traditional folk music and left-wing political activism. From this period, some of his best-known songs are "Plegaria a un Labrador" ("Prayer to a Worker") and "Te Recuerdo Amanda" ("I Remember You Amanda").
What is an example of his artistic work?
A: He released his first album, Canto a lo humano,

IN: Joe Frazier was the 12th child born to Dolly Alston-Frazier and Rubin in Beaufort, South Carolina. He was raised in a rural community of Beaufort called Laurel Bay. Frazier said he was always close to his father, who carried him when he was a toddler "over the 10 acres of farmland" the Fraziers worked as sharecroppers "to the still where he made his bootleg corn liquor, and into town on Saturdays to buy the necessities that a family of 10 needed." Young Frazier was affectionately called "Billie Boy."

In 1964 heavyweight representative Buster Mathis qualified but was injured so Frazier was sent as a replacement. At the Heavyweight boxing event, Frazier knocked out George Oywello of Uganda in the first round, then knocked out Athol McQueen of Australia 40 seconds into the third round. He was then into the semi-final, as the only American boxer left, facing the 6 foot 2, 214 lb. Vadim Yemelyanov of the Soviet Union. "My left hook was a heat-seeking missile, careening off his face and body time and again. Twice in the second round I knocked him to the canvas. But as I pounded away, I felt a jolt of pain shoot through my left arm. Oh damn, the thumb." Joe would say. Joe knew immediately the thumb of his left hand was damaged, though he wasn't sure as to the extent. "In the midst of the fight, with your adrenaline pumping, it's hard to gauge such things. My mind was on more important matters. Like how I was going to deal with Yemelyanov for the rest of the fight." The match ended when the Soviet's handlers threw in the towel at 1:49 in the second round, and the referee raised Joe's injured hand in victory. Now that Joe was into the final, he didn't mention his broken thumb to anyone. He went back to his room and soaked his thumb in hot water and Epsom salts. "Pain or not, Joe Frazier of Beaufort, South Carolina, was going for gold." Joe proclaimed. Joe would fight a 30-year-old German mechanic named Hans Huber, who failed to make it on the German Olympic wrestling team. By now Joe was used to fighting bigger guys, but he was not used to doing it with a damaged left hand. When the opening bell sounded on fight night, Joe came out and started swinging punches, he threw his right hand more than usual that night. Every so often he'd used his left hook, but nothing landed with the kind of impact he managed in previous bouts. Under Olympic rules, 5 judges judge a bout, and that night three voted for Joe.

Who was his next opponent after McQueen?

OUT:
the 6 foot 2, 214 lb. Vadim Yemelyanov of the Soviet Union.