Youth and college Krupnik was born in
Ukraine and is Jewish. He moved with his parents, Mark and Rita, and brother Vladimir, from his native
Khmelnytskyi, Ukraine, to the United States in the 1990s, settling in
San Francisco, California. Initially a promising gymnast, Krupnik was spotted playing football with some friends by the manager of the San Francisco Vikings youth team, and the youngster quickly changed sports. Krupnik was also strong academically, and was on the Dean's Honor List in Fall of 2000.
Professional Krupnik was drafted with the 69th pick of the
2002 MLS SuperDraft by the
MetroStars, but did not make the squad, and instead spent the 2002 season with the
Des Moines Menace of the
Premier Development League. He was signed by the MetroStars late in the season, again without seeing any first-team action, and was then released on free transfer to the
Wilmington Hammerheads. After winning the 2003 championship with Wilmington, Krupnik was signed by
Charleston Battery. During his time in Israel in 2005 with the US
Maccabiah Games team, Krupnik caught the eye of a scout from
Maccabi Netanya. Krupnik stayed with the club until the winter recess when he decided not to continue after Maccabi Herzliya would not agree to a new contract. After leaving Maccabi Herzliya, Krupnik joined
Bnei Sakhnin for the second half of the 2006–07 season and helped the club gain promotion to the
Israeli Premier League. The following season Krupnik helped the newly promoted side to a fourth-place finish and qualification to the
Intertoto Cup. On June 17, 2008, Krupnik signed a contract with
Maccabi Haifa for 3 years worth $360,000. During his first season with the club Krupnik was a fixture in central defense appearing in 30 league matches, and helped Maccabi Haifa clinch their 11th
Israeli Premier League title. Krupnik returned the
New York Red Bulls, known as the MetroStars during his first stint with the club, in July 2009. Krupnik made his MLS debut in a 4–0 loss to
Colorado Rapids on July 25, 2009, and played in three games for the team before returning to Israel in November, when he was signed for a second stint with
Maccabi Netanya. Since 2015 Krupnik has been the soccer coach at
Menlo-Atherton High School in California.
International In 2005, coach
Lev Kirshner picked Krupnik for the United States squad for the
2005 Maccabiah Games, an international Jewish athletic event similar to the Olympics held in Israel every four years. Kirshner brought a talented squad with the most professional experience ever. The American team, which also had
Jonathan Bornstein and
Benny Feilhaber playing for it, reached the final but lost to the host
Israeli team, which was composed of Israel's Under-21 national team players. ==Statistics==