Tomas Lindahl is a Swedish chemist known for his groundbreaking work in the field of DNA repair. He was awarded the Nobel Prize in Chemistry in 2015, sharing it with Paul L. Modrich and Aziz Sancar for their contributions to understanding how cells maintain the integrity of their genetic material. Lindahl's research has significantly advanced our knowledge of how DNA damage occurs and how cells repair it, which is crucial for understanding diseases like cancer. His findings have implications for various fields, including molecular biology, genetics, and medicine.