who is the producer when the narrator is katherine kellgren, the year is before 2013 and the author is karen cushman?
CREATE TABLE "odyssey_award_winners_and_honor_audioboo" (
  "year" real,
  "title" text,
  "producer" text,
  "narrator" text,
  "author" text,
  "citation" text
);
SELECT "producer" FROM "odyssey_award_winners_and_honor_audioboo" WHERE "narrator"='katherine kellgren' AND "year"<2013 AND "author"='karen cushman';