In December 2016 , Hall abruptly resigned his role as CIO ( no mention was made of his role as CEO or COO ) .
Hall previously served as its Executive chairman and Chief Investment Officer , and owns 47 % of the firm .
In December 2016 , Hall abruptly resigned his role as Chief Investment Officer ( no mention was made of his role as CEO or COO ) .
Hall previously served as its Executive chairman and Chief Investment Officer , and owns 47 % of the firm .