Name the number of season number for jeff truman
CREATE TABLE "table1_15838081_3" (
  "season_num" real,
  "series_num" real,
  "title" text,
  "director_s" text,
  "writer_s" text,
  "original_airdate" text
);
SELECT COUNT("season_num") FROM "table1_15838081_3" WHERE "writer_s"='Jeff Truman';