Grant Achatz (/ˈækɪts/ AK-its) (born April 25, 1974)[1] is an American chef and restaurateur often recognized for his contributions to molecular gastronomy or progressive cuisine.

In 2001, Achatz advanced to position of Executive Chef at Trio in Evanston, Illinois, which at the time of his arrival had a four-star rating from the Mobil Travel Guide.

The restaurant is located up the block from the famed Steppenwolf Theatre Company and is housed in a modest gray brick building which bears no external markings beyond its street number.

[13] In 2016 Achatz and partner Nick Kokonas closed Alinea for a complete renovation and overhaul of the food, space, and experience.

In 2016 Achatz and his team launched two consecutive multi-week pop-up experiences in Madrid, Spain, and Miami, Florida, over the course of Alinea's closure.

In October 2008, Grant Achatz and co-author Nick Kokonas published Alinea, a hardcover coffee table book featuring more than 100 of the restaurant's recipes.

As in the style of the Alinea cookbook, both books provide the exact recipes used during the Paris 1906 and Tour of Thailand menus, without making adjustments for the average home cook.

On July 23, 2007, Achatz announced that he had been diagnosed with stage 4 squamous cell carcinoma of the mouth, which spread to his lymph nodes.

This led to full remission, albeit with some side effects including a transitory loss of his sense of taste, which eventually returned.

He credited an aggressive protocol of chemotherapy and radiation therapy administered at the University of Chicago Medical Center for driving his cancer into full remission.

In 2024 he appeared in a cameo role alongside chefs Daniel Boulud, Thomas Keller, Malcolm Livingston, Christina Tosi, Genie Kwon, Wylie Dufresne, Anna Posey, and Rosio Sanchez on the season three finale of The Bear.