In his senior year in high school, Lin captained Palo Alto High School to a 32Ð1 record and upset nationally ranked Mater Dei, 51Ð47, for the California Interscholastic Federation (CIF) Division II state title.
He applied to Stanford, Cal, UCLA, Harvard and Brown. The Ivy League schools were the only ones who actively recruited him, but do not offer athletic scholarships. He played for Harvard. He gained national attention for his performance against the 12th ranked Connecticut Huskies, against whom he scored a career-high tying 30 points and grabbed nine rebounds on the road. Lin finished his career as the first player in the history of the Ivy League to record at least 1,450 points (1,483), 450 rebounds (487), 400 assists (406) and 200 steals (225).

Lin went undrafted in the 2010 NBA Draft. Donnie Nelson of the Mavericks was the only General Manager that offered him an invitation to play in the Summer League. After the summer league, Lin received offers from 4 teams. he signed with his hometown Warriors. Lin received little playing time during the season. Three times during the season, Lin was assigned to the Warriors' D-League affiliate.

Lin increased his weight, strength (adding 6 inches to his running vertical jump) and shooting during the off season.
, but on Dec., 2011 the Warriors waived Lin. The Houston Rockets picked him up but then waived him before the start of the season.

The New York Knicks claimed Lin off waivers on December 27. On January 17, 2012, Lin was assigned to the Erie BayHawks of the D-League. Lin was brought back and after newly signed gard Baron Davis suffered a setback, Lin was given a chance to play due to "desperation", according to experts.
On February 4, Lin outplayed All-Star guard Deron Williams and had 25 points, five rebounds, and seven assistsÑall career-highsÑin a 99Ð92 Knicks victory over the New Jersey Nets. In the subsequent game against the Utah Jazz, Lin made his first career start and had 28 points and eight assists in the Knicks' 99Ð88 win. On February 10, Lin scored a new career-high 38 points and had seven assists, leading the Knicks in their 92Ð85 victory over the Los Angeles Lakers. He outscored the Lakers' Kobe Bryant. Lin was named the Eastern Conference Player of the Week after averaging 27.3 points, 8.3 assists and 2.0 steals in those four starts with the Knicks going undefeated.
Lin became the first NBA player to score at least 20 points and have seven assists in each of his first five starts.

New York had a 7Ð0 record after Lin started receiving major playing time, 6Ð0 with him starting.
The media started using the term Linsanity, describing the excitement over the unheralded Lin. Bids for his rookie card exceeded $21,000 on eBay.

Lin, a humble evangelical Christian, credits God and his fellow players with his success.

On April 1, he decided to get his injured knee operated on which will put him out of the season.

Links:
Jeremy Lin - Wikipedia