He was a Fulbright Scholar, a Wertheim Fellow, President of the National Academy of Arbitrators and member of the College of Labor and Employment Lawyers.

234, which sought to avert a strike facing Amtrak from its workers represented by the Brotherhood of Maintenance of Way Employees (BMWE).

[3] On October 6, 2011, Obama chose him as a member of the board to tackle labor disputes between the rail freight industry and its unions.

He also had extensive experience interviewing trade unionists and promoting Arbitration mechanisms in South Africa.

Zack is regarded as a student and protege of former U.S. Secretary of Labor John T. Dunlop, who saw himself as a problem solver and someone seeking to overcome polarizing ideological stances.