She was mentored by her English teacher Ava Carr at Fremont High School in Los Angeles and encouraged to be independent and study law.

The 1957 film No Down Payment, based on the novel by John McPartland, touched on some of the discriminatory racial covenant issues referenced in Davis v. Carter (1948) in a scene in the film where Asian buyers were discouraged from purchasing a home in the new housing tract by obsolete racial restrictions in the subdivision property deeds that were no longer enforceable.

After WWII Mack worked with Macbeth Sr. for a court order to restore property that had been confiscated from Japanese Americans during their internment during the war.

Sakamoto joined the firm after being released from an internment camp and became Eva Mack's close associate, colleague and friend.

In the mid-1950s it was still difficult for a woman to be hired as a lawyer in a Los Angeles law firm when women attorneys were only allowed to serve as secretaries.

Mack overcame the obstacle by building her own office in South Central Los Angeles at 8200 S. Broadway and developing clientele by teaching 'Business and Family Law' in the evening at Washington Adult School.