CREATE TABLE table_17355743_1 (directed_by VARCHAR, written_by VARCHAR)

Name who directed the episode by joe sachs and david zabel
SELECT directed_by FROM table_17355743_1 WHERE written_by = "Joe Sachs and David Zabel"
SELECT "directed_by" FROM "table_17355743_1" WHERE "Joe Sachs and David Zabel" = "written_by"