Students at one of Brisbane's most exclusive schools are in mourning after it was revealed a man who fell to his death off the Story Bridge this morning - along with his two-year-old son - was a teacher.

Anglican Church Grammar School headmaster Jonathan Hensman this afternoon said students and staff were grieving the loss of teacher and rugby union enthusiast Jason Lees.

Anglican Church Grammar School teacher Jason Lees has been found dead.

Police are interviewing witnesses who saw Mr Lees, 40, and his son plunge to their deaths off the Story Bridge at about 3.20am today.

Mr Hensman said Mr Lees was a "highly regarded and much loved teacher" at Churchie "whose kindness to his students, his gentlemanly approach and enthusiasm for teaching were appreciated by students, parents and his colleagues".