Question: Who is Major League Soccer's first all-time leader in regular season goals, known for playing forward and attacking midfielder?
Context: Dwayne Anthony De Rosario (born May 15, 1978) is a retired Canadian professional soccer player, who played as a forward or as an attacking midfielder.  A versatile attacker, he played for the Toronto Lynx, FSV Zwickau and Richmond Kickers early in his career.  He came to prominence in the 2000s playing in Major League Soccer for the San Jose Earthquakes, Houston Dynamo, Toronto FC, New York Red Bulls and D.C. United.  A four-time MLS Cup champion, he also won the 2011 MLS Most Valuable Player award.  He is the sixth-leading scorer in MLS history with 104 goals. The 2014 Major League Soccer season was the 102nd season of FIFA-sanctioned soccer in the United States and Canada, the 36th with a national first-division league, and the 19th season of Major League Soccer.  This season featured 19 total clubs (16 from the United States and 3 from Canada), each playing 34 matches during the regular season. Glenn Chris Anderson (born October 2, 1960) is a retired Canadian professional ice hockey player who played 16 seasons in the National Hockey League (NHL) for the Edmonton Oilers, Toronto Maple Leafs, New York Rangers, and St. Louis Blues.  Anderson was known to have a knack for stepping up in big games, which garnered him the reputation of a "money" player.  His five playoff overtime goals rank third in NHL history, while his 17 playoff game-winning goals put him fifth all-time.  During the playoffs, Anderson accumulated 93 goals, 121 assists, and 214 points, the fourth, ninth, and fourth most in NHL history.  Anderson is also first all-time in regular season game winning goals in Oilers history with 72. Michael Dean Bossy or, according to some sources, Michael Jean Bossy (born January 22, 1957) is a Canadian former ice hockey player who played for the New York Islanders for his entire career and was a crucial part of their four-year reign as Stanley Cup champions in the early 1980s.  Among many other remarkable achievements, he was the only player in NHL history to score consecutive Stanley Cup winning goals (1982 and 1983) and the only player to record four game-winning goals in one series (1983 Conference Final).  He is the NHL's all-time leader in average goals scored per regular season game, holds the NHL's third highest all-time average points scored per regular season game, and is one of only five players to score 50 goals in 50 games.  On January 27, 2017, in a ceremony during the All-Star Weekend in Los Angeles, Bossy became part of the second group of players to be named one of the '100 Greatest NHL Players' in history. The 1996 Major League Soccer All-Star Game was the first Major League Soccer All-Star Game, a soccer match involving all-stars from Major League Soccer.  Teams of the best players from each conference played against each other at Giants Stadium, East Rutherford, on July 14, 1996.  The MLS All-Stars East won the game 3–2, with goals from Tab Ramos, Giovanni Savarese and Steve Pittman while Preki and Jason Kreis scored for the MLS All-Stars West.  MLS All-Stars East midfielder Carlos Valderrama was named as the game's Most Valuable Player.  Kevin Stott refereed the game, which was attended by 78,416 spectators. Paul Bravo (born June 19, 1968 in Campbell, California) is a former American soccer midfielder and forward who played six seasons in Major League Soccer, two in the American Professional Soccer League and two in the USISL.  He also earned four caps, scoring one goal, with the United States men's national soccer team.  After his retirement from playing, Bravo served for several years as an assistant coach in both Major League Soccer and the NCAA and was most recently Technical Director for the Colorado Rapids. The Willie Marshall Award is given to the American Hockey League's leading goal scorer for the regular season.  The award was established in the 2003–04 season to honour Willie Marshall, the AHL's all-time leader in goals, assists, points and games played.  Marshall is also the AHL's all-time leader in post-season scoring. Columbus Crew SC is a professional soccer team in the United States.  The team is a member of the Eastern Conference of Major League Soccer, the top professional soccer league of the United States and Canada.  Crew SC has had five different head coaches since joining the league in 1996.  Timo Liekoski, the only Finnish head coach in MLS history, was the first head coach in 1996, but started 6-16 and was fired midseason to be replaced by Tom Fitzgerald.  Fitzgerald is currently the all-time leader in regular season wins (70), playoff appearances (four) and playoff wins (nine). Jeff Cunningham (born August 21, 1976) is an American soccer player.  He is Major League Soccer's second-all-time leader in regular-season goals scored with 134, following Landon Donovan. Landon Timothy Donovan (born March 4, 1982) is an American former professional soccer player who played as a forward and attacking midfielder.  He holds numerous individual records in Major League Soccer (MLS) and for the United States national team and is often regarded as the greatest American men's soccer player of all-time.
Answer: Landon Donovan