Roz Garber was born in 1950 and raised in Toronto. Her family was active in the Reform movement, and as a young adult, Garber was a leader in the Reform temple youth group, receiving scholarships to attend UAHC summer camps in the US. After earning a BA in Jewish Studies at the University of Toronto, Garber left Toronto to get a Masters in Jewish Education at Brandeis. It was there that she met her husband, who was studying for a Masters in Jewish Communal Service.
Garber and her husband moved to Toronto after they graduated and worked in the Jewish community. Through this work, they became actively involved in the issue of Soviet Jewry. In 1975, they were chosen to visit the Soviet Union on a secret mission run by the Jewish Agency. During their three-week trip, they met with Refuseniks, such as Anatoly Sharansky, gave them educational materials, and shared information with them about Israel. In Kishinev, they were intercepted by the KGB, who followed them throughout the rest of their trip and prevented them from contacting more Refuseniks. Upon their return from the Soviet Union, Garber and her husband embarked on speaking tours to share their experiences and educate the American Jewish community about conditions for Jews in the Soviet Union.
Garber has continued to devote her volunteer and professional time to the Jewish community. She had worked at the Synagogue Council of Massachusetts and at Hadassah Boston. She has three daughters, who share her passion for Jewish communal service.