郭美貞（1940-2013），管弦樂指揮家。出生於越南西貢（今胡志明巿）。1955年入澳洲雪梨音樂院，1964年獲獎學金至義大利接受指揮家卡洛‧策基與巴比羅利爵士指導。1965年11月她加入中義文化經濟訪問團，首度造訪臺灣，自此開啟她在臺灣的音樂之路，先後指導過臺灣省立交響樂團（今國立臺灣交響樂團）、臺南三B兒童管弦樂團、臺北巿立交響樂團等。1966年獲臺灣十大傑出女青年，1967年代表臺灣贏得紐約密特羅波洛斯國際大賽首獎，任紐約愛樂助理指揮，1970年代活躍於臺灣與國際舞台。1979年受國泰蔡辰男之邀，擔任臺北愛樂交響樂團指揮，至1983年樂團解散後返回澳洲。1990年為郭美貞最後一次在臺灣公開演出，後將重心移至菲律賓音樂界。她是難得一見的傑出女指揮家，享譽國際，也為1970年代的臺灣樂團發展做出極大的貢獻。

QUACH, Helen (1940-2013) was an orchestral conductor. She was born in Saigon, Vietnam (now Ho Chi Minh City). She entered the Sydney Conservatorium of Music in 1955, and in 1964 received a scholarship to study in Italy with conductors Carlo Zecchi and Sir John Barbirolli. In November 1965 she joined the Chinese-Italian Culture and Economy Research Team and made her first visit to Taiwan, thus beginning her Taiwanese music career. Orchestras she conducted included the Provincial Taiwan Symphony Orchestra (now the National Taiwan Symphony Orchestra), the Tainan 3B Children’s Symphony Orchestra, and the Taipei Symphony Orchestra. In 1966 she was selected as one of ten outstanding young Taiwanese women, and in 1967 won first place at the Dimitri Mitropoulos International Music Competition. She then served as assistant conductor of New York Philharmonic. In the 1970s she was particularly active on both the Taiwanese and international music stage; in 1979 she was invited by Tsai Chen-Nan, the Chairman of the Cathay Group, to conduct the Taipei Philharmonic Symphony Orchestra, which she did until her return to Australia upon the disbanding of the orchestra. Quach’s last public performance in Taiwan was in 1990, after which she shifted her focus to the Philippines’ music scene. She was an exceptionally outstanding woman conductor of international renown who contributed greatly to the development of Taiwanese orchestras.