user: Question: Who wrote the episode seen by 10.64 million people in the US?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [118.0, 1.0, '"Epilogue"', 'David Von Ancken', 'Pam Veasey', 'September23,2009', '15.06']
SQL:

assistant: SELECT "Written by" FROM "Table" WHERE "U.S. viewers (millions)" = '10.64';