He served as Resident Manager from 1923 to 1956 .
Dr. Zetek was the Founding Director of the Canal Zone Biological Area ( CZBA ) , located on Barro Colorado Island , Panama .
Zetek served as Resident Manager from 1923 to 1956 .
Dr. Zetek was the Founding Director of the Canal Zone Biological Area ( CZBA ) , located on Barro Colorado Island , Panama .