user: Question: Name who directed the episode by Joe Sachs and David Zabel
Columns: ['Series #', 'Season #', 'Title', 'Directed by', 'Written by', 'Original air date']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [158.0, 1.0, '"Four Corners"', 'Christopher Misiano', 'Jack Orman and David Zabel', 'September27,2001']
SQL:

assistant: SELECT "Directed by" FROM "Table" WHERE "Written by" = 'Joe Sachs and David Zabel';