William Reinhold "Gatz" Hjortsberg was an American novelist and screenwriter, known for his originality and for writing the screenplay of the film Legend. His novel Falling Angel was the basis for the film Angel Heart (1987). The novel was adapted into an opera in 2015, composed by J. Mark Scearce with a libretto by Lucy Thurber. His 2015 novel Mañana is a thriller set in Mexico.

Hjortsberg was the only child of a Swedish restaurateur father and a Swiss mother. He attended Dartmouth College, the Yale School of Drama (where he met Thomas McGuane), and was a Stegner Fellow at Stanford University. He was married three times, and had a son and a daughter. He died of pancreatic cancer.

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William Reinhold “Gatz” Hjortsberg 是一位美国小说家和编剧，以其独创性和撰写电影《传奇》的剧本而闻名。他的小说《堕落天使》是电影《天使之心》（1987）的基础。这部小说于 2015 年被改编成歌剧，由 J. Mark Scearce 作曲，Lucy Thurber 作词。他 2015 年的小说《Mañana》是一部以墨西哥为背景的惊悚片。

Hjortsberg是瑞典餐馆老板父亲和瑞士母亲的独生子。他曾就读于达特茅斯学院、耶鲁大学戏剧学院（在那里他遇到了托马斯·麦瓜恩），并且是斯坦福大学的斯蒂格纳研究员。他结过三次婚，育有一子一女。他死于胰腺癌。