The colourist, who has spent 12 years at Framestore, starts in April and will work on the company's drama and feature film output.
David Barrett, recently promoted to Ascent 142 vice president of UK sales, said: “Adam is recognised as one of the biggest talents in our industry and someone whose work we have followed for quite a while.
"Adding yet another outstanding creative talent to the team means our clients work, as ever, is in the best hands from start to finish when they come to Ascent142”
Commenting on his appointment, Glasman said: “Joining Ascent 142 at this moment in time is extremely exciting, what with the projects that are coming through, the new DI suites at Wardour Stree and the great talent.”
Glasman's credits include The Chronicles of Narnia, Prince Caspian, In Bruges and the two James Bond films Die Another Day and Casino Royale.
Ascent 142 recently poached colourist Jet Omoshebi from Pepper.