How many people directed the show written by Chris Sheridan?
CREATE TABLE "table1_14724369_1" (
  "no_in_series" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text
);
SELECT COUNT("directed_by") FROM "table1_14724369_1" WHERE "written_by"='Chris Sheridan';