American film director, producer, screenwriter, and author, best known for his work in the "Star Trek" franchise. He directed "Star Trek II: The Wrath of Khan" and co-wrote "Star Trek IV: The Voyage Home" and "Star Trek VI: The Undiscovered Country." His career began with writing the bestselling novel "The Seven-Per-Cent Solution," which led to an Oscar-nominated screenplay. His work is noted for blending literary elements with popular science fiction, often revitalizing established series.