Loren Galler-Rabinowitz was born on January 19, 1986 in Boston, Massachusetts. The eldest child of Janina Galler, a psychiatrist and neurologist, and Burton Rabinowitz, a cardiologist, she has twin sisters, Arielle and Danielle. Her maternal grandparents, Eva and Henry Galler, were Polish Jews who survived the Holocaust and then lived in Sweden, where Janina was born, before moving to the United States.
Galler-Rabinowitz played the piano from the age of ten months and won the Massachusetts state piano competition in the junior high division. She graduated from The Park School and then from Buckingham Browne and Nichols School in Cambridge in 2004. After graduating from Harvard University in 2010, she enrolled at the Columbia University College of Physicians and Surgeons, pursuing an MD degree. In 2015, Galler-Rabinowitz graduated from medical school an Alpha Omega Alpha member. In June 2015, she began an internal medicine residency at New York Presbyterian Columbia.
Galler-Rabinowitz began figure skating at the age of two and moved into ice dancing when she was nine. She competed with partner David Mitchell from age 11 to 20. They were coached by Barret Brown, Tom Lescinski, and Karen Cullinan in Boston from 1998 to May 2004.
Galler-Rabinowitz/Mitchell won the 1999 North American Novice Challenge Skate in Toronto, the 2000 U.S. Eastern Sectional Championships (Novice), the 2000 U.S. Championships (Novice), the 2002 Eastern Sectional Championships (Junior), and the 2002 U.S. Championships (Junior). They placed fourth overall at the 2003 World Junior Championships, winning their two compulsory dances. They won the pewter medal at the 2003 U.S. Championships (senior) and a bronze medal at the 2004 U.S. Championships, a total of four national medals in four years.
In May 2004, Galler-Rabinowitz/Mitchell decided to relocate to Stamford, Connecticut to train under Natalia Dubova. In the 2004–05 season, they placed ninth at both of their Grand Prix events. In December 2004, Mitchell decide to undergo surgery to repair a grade two superior and anterior cartilage tear in the labrum of his left shoulder. As a result, the dance team missed the 2005 U.S. Championships and returned to competition the following season. They ended their partnership after placing ninth at the 2006 U.S. Championships.
In March 2011, the National Jewish Sports Hall of Fame awarded her the Marty Glickman Award, as the female Jewish Athlete of the Year.
GP: Grand Prix; JGP: Junior Grand Prix
Galler-Rabinowitz competed in the Miss Massachusetts USA 2010 pageant in 2009 and made the semi-finals. After winning the Miss Collegiate Area local pageant, she won the Miss Massachusetts title on June 26, 2010. She competed in the Miss America 2011 pageant in January 2011, and won the Children's Miracle Network's Miss Miracle Maker award for raising the most money for charity.