Seiden, a great star at St. John's, is in not only the St. John's University Athletic Hall of Fame but also the New York City Basketball Hall of Fame. Alan was All-America in 1959, the year he captained the Redmen to the NIT championship. That season, he also won the Haggerty Award, given annually to the outstanding player in the Metropolitan New York area.
In the 1959 NIT title contest, Seidman had 21 points (13 down the stretch, as he recalls) to go with 7 rebounds and 8 assists. Joe Lapchick, the legendary coach of St. John's, presented Alan with the game ball. Basketball columnist Peter Vecsey, describing Alan's greatness in The New York Post recalled that on each and every ground raid to the basket, Seidman would infuriate opponents by shouting "and one!" regardless of whether he was actually fouled. Ask anybody who every played against him, 30 years or so before an edgy sneaker company copyrighted that phrase, it was his sardonic signature saying. Siden played three seasons of varsity basketball (from 1957-1959, since freshmen could not play varsity), and finished his career as one of the greatest players in school history. His 21.9 points per game during the 1958-59 season is also tenth in school history.
Alan was an outstanding guard at Jamaica High School in Queens. In 1955, when Seiden was a senior, he led his team to the PSAL title. That season, he led New York City in scoring and was compared to the great Bob Cousy. A four-year starter at Jamaica, Seiden finished his schoolboy career with 1,349 points, a PSAL record. Seiden scored 101 points in the PSAL tournament, including 31 in the final against Madison High School, led by future NBA All-Star Rudy LaRusso.
After graduating from Jamaica, Seiden attended St. John's University and became one of the greatest players in school history. In 1957, the sophomore Seiden was the team's second leading scorer with 273 points and a 11.9 points per game average; he also grabbed 88 rebounds.
As a junior in 1958, Seiden was team co-captain and named Helms second team All-America. St. John=s won their first nine games of the season and finished the regular season with a record of 16-6.
In 1959, Seiden repeated as team captain and had one of the greatest individual seasons in school history. Named Helms and NEA first team All America, and Converse and Sporting News second team All America, Alan led the team in scoring for the second consecutive season with 570 points (21.9 points per game). He added 102 rebounds as well, and scored a career-high 38 points in a mid-season game against Loyola(Illinois).
That year, Seiden led St. John=s to a 17-7 record and a No. 17 (UP) ranking. Invited back to the NIT, the unseeded Redmen surprised the country as they defeated Villanova, 75-57, beat St. Bonaventure 82-74, and trounced Providence 76-55 to reach the tournament final. In the championship games, Seiden scored a game-high 22 points and St. John=s defeated Bradley, 76-71, in overtime to win the tournament. Alan averaged 20.0 points per game in the tournament. The New York Times in priasing his performance, referred to him as "Alan Seiden, the senior without whose shooting, driving, feeding, and steadying influence, the Redmen would have been in trouble."
After graduating from St. John=s, Seiden played one season of professional basketball in the American Basketball League. The new league started in 1961 and he played 21 games for the Pittsburgh Rens that year (one of his teammates was the great Connie Hawkins). Seiden scored 9.2 points per game that year and Pittsburgh finished with a record of 41-40.