CREATE TABLE table_63639 ("Year" FLOAT, "Category" TEXT, "Nominee ( s ) " TEXT, "Episode" TEXT, "Result" TEXT)

What episode after 1998 had John Wells as the nominee?
SELECT "Episode" FROM table_63639 WHERE "Year" > '1998' AND "Nominee(s)" = 'john wells'
SELECT "Episode" FROM "table_63639" WHERE "Nominee(s)" = 'john wells' AND "Year" > '1998'