user: Question: Who directed episode 28 in the series?
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: [25.0, 1.0, '" Our Father "', 'Keith Gordon', 'Clyde Phillips', 'September28,2008', 'N/A']
SQL:

assistant: SELECT "Directed by" FROM "Table" WHERE "No. in series" = 28.0;