[3] Mack was the first member of his family to emigrate to the United States, and he was subsequently reunited with his brothers, who invested in real estate.
"[2] Mack got into the gambling industry by installing jukeboxes from Rock-Ola and slot machines from Jennings & Company in bars throughout central and southern Nevada,[2] including Beatty, Manhattan, Pioche, Round Mountain and Tonopah.
[3] Subsequently, Mack invested in land and casinos with businessmen Sanford Adler, Gus Greenbaum, Charlie Resnick, Art Rosen and Moe Sedway.
[2][4][6] Mack served as its chairman while Walter E. Cosgriff was its president until he was succeeded by E. Parry Thomas in 1961.
[3] With his wife, Mack co-founded "Sons and Daughters of Israel" in Las Vegas, which is the oldest Jewish congregation in Nevada.