Biography
Sam Chalsen is a writer and producer. He co-wrote the screenplay for the 2026 film Unabomber with Nelson Greaves, on which he also serves as executive producer.
Chalsen wrote for the television series Sleepy Hollow (2013–2017), serving as executive story editor among other credits, and contributed as writer and producer to The Flash (2014–2023). With Greaves, he began his career after their pilot Potus Maximus sold to Fox; their subsequent projects included the screenplay for Spy Hunter.
Chalsen graduated from Harvard University in 2012, where he completed a screenwriting thesis.
