The late film critics Gene Siskel and Roger Ebert created a television show that made them household names, and made their “two thumbs up” a coveted endorsement. Author and film critic Matt Singer looks at their unique role in Hollywood history in his new book, “Opposable Thumbs: How Siskel & Ebert Changed Movies Forever.”

The late film critics Gene Siskel and Roger Ebert created a television show that made them household names, and made their “two thumbs up” a coveted endorsement. Author and film critic Matt Singer looks at their unique role in Hollywood history in his new book, “Opposable Thumbs: How Siskel & Ebert Changed Movies Forever.”