Hee Seo

In 2014, Seo had the opportunity to dance several full-length roles in her second year as principal, when three of ABT's senior principal ballerinas announced their retirement, placing Seo in line for several leading roles. In the 2016 ABT season, nearly ten years from Seo's lead role debuted, she along with the also promoted Principal dancer Cory Stearns, reprised their roles as Romeo and Juliet as first cast at the Wolf Trap National Park for the Performing Arts. Seo has said, "when I dance with Cory, I feel like I’m going back to those years". Seo also reprised her role as Princess Aurora in Sleeping Beauty. Alastair Macauley of The New York Times on Seo's performance, "she has most revealed the distinctiveness, elegance and authority of an important ballerina". She commonly partners with Roberto Bolle, including Bolle's final performance with ABT.

Seo's debut performance as Principal dancer in 2012 was as Princess Aurora in The Sleeping Beauty and the Swan Queen in Swan Lake. Seo has said that Swan Lake was her most challenging ballet. The iconic classic ballet is notoriously difficult and demanding. The lead ballerina performs the contrasting roles of Odette, the White Swan, and Odile, the Black Swan. In an interview with Pointe magazine, Seo said that she "prefers the mental and physical challenge of full-length ballets over repertory works". In particular, Swan Lake "is physically and mentally exhausting, but so beautiful."

She became a soloist in August 2010 and principal dancer in July 2012. She was the first Korean ballerina to be promoted to principal dancer in ABT's 75-year history and, at age 26, one of the company's youngest dancers to be so promoted. Her promotion drew further attention as Seo was one of only three principal dancers in the company to have been promoted from the ABT Studio Company. Julia Moon, the Ballet Director of Universal Ballet, said that "Seo has an incredible talent, not just in dancing but also acting. I have never doubted that someday she would become a principal dancer at ABT". Seo has been noted for her "lyrical and open" style and "unique feminine strength" by several critics including The New York Times, Dance Magazine, and KoreAm.

In the beginning, Seo's transition to the ABT company was difficult. She had trained under the Russian syllabus at Cranko and needed to make the transition to the "American style". Seo noted that "the ABT style is to leave the dancers alone. Individual character matters here, and dance that lacks originality cannot survive". She was able to adapt with the assistance of her mentors who also at the time helped her overcome a serious back injury. In March 2006, she was promoted to the rank of corps de ballet. She gained significant attention in 2009 when she performed the female lead in MacMillan's Romeo and Juliet, La Sylphide, and On the Dnieper. She debuted as Juliet on her twenty-third birthday which she has said was "one of [her] favorites". Cory Stearns, at the time a newly promoted member of the corps de ballet, partnered her as the other titular character of Romeo.

She was rapidly promoted from the ABT Studio Company and joined the full company in May 2005. She was again quickly promoted into the corps de ballet in March 2006 and then to soloist in August 2010 before finally being named as principal dancer in July 2012 by Kevin McKenzie, the artistic director of ABT. During her time at ABT, she has performed numerous lead roles in classical and contemporary ballet.

Seo began training in Russian ballet at the age of twelve; a relatively late start for a ballet dancer. Seo has stated on numerous occasions that she did not have aspirations of becoming a professional ballet dancer. Her teachers identified her skills and talents early on and within a short period of time she was offered full scholarships to study abroad at prestigious ballet schools. She gained further notice by winning a scholarship at the 2003 Prix de Lausanne as well as the Grand Prix at the 2003 Youth America Grand Prix.

Seo won the 2003 Prix de Lausanne Award in Switzerland and was offered a scholarship by Reid Anderson to attend the John Cranko Schule. That same year, Seo won the Grand Prix at the 2003 Youth America Grand Prix. John Meehan asked her to join the American Ballet Theatre Studio Company in the following year where she stayed until joining American Ballet Theatre as an apprentice in May 2005.

Hee Seo (Korean: 서희 ; Hanja: 徐姬 ; born 13 March 1986) is a South Korean ballet dancer who is a principal dancer at the American Ballet Theatre (ABT), one of the three leading classical ballet companies in the United States. She became the company's first Korean ballerina to be promoted to principal dancer in ABT's 75-year history. She is also one of the youngest dancers in ABT history to be promoted to principal at the age of twenty-six. The New York Times has described her style and dancing to "exude an unhurried purity that sums up all that is lovely about ballet" and by Vogue as "unspeakably lissome". Several critics have noted her style as "lyrical and open" and she has been critically acclaimed for her "humility" and "unique feminine strength".