CREATE TABLE table_203_593 (id DECIMAL, "tenure" TEXT, "coach" TEXT, "years" DECIMAL, "record" TEXT, "pct." DECIMAL, "ncaa tournament" DECIMAL)

which head coach had the most losses ?
SELECT "coach" FROM table_203_593 ORDER BY "record" DESC LIMIT 1
SELECT "coach" FROM "table_203_593" ORDER BY "record" DESC NULLS LAST LIMIT 1