user: Question: What crew chief has an owner name Jack Roush and driver Greg Biffle?
Columns: ['Team', 'Car(s)', 'Driver(s)', 'Primary Sponsor(s)', 'Owner(s)', 'Crew Chief']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['BK Racing', 'Toyota Camry', 'David Reutimann', 'Burger King / Dr Pepper', 'Ron Devine', 'Doug Richert']
SQL:

assistant: SELECT "Crew Chief" FROM "Table" WHERE "Owner(s)" = 'Jack Roush' AND "Driver(s)" = 'Greg Biffle';