Nature Magazine: Jean Bourgain (1954–2018)
"Bourgain lived and breathed mathematics. A night owl who travelled frequently back and forth between the IAS and California, where his wife and son lived, he would often, when at Princeton, show up at the IAS shortly before afternoon tea and work with collaborators until well past midnight. Then, after the others had gone to bed, he would continue into the night. His collaborators would often wake up to an e-mail from Bourgain sent at 4 a.m., containing the solution to a problem that, the night before, had seemed as if it would take weeks to crack."
Read more at Nature.