Jackson, who was 5 of 11 from the field, scored eight of his points at the free throw line for the Seawolves (4-1), who were 27 of 31 from the stripe.
Forward Tommy Brenton pulled down 14 rebounds for Stony Brook, which outrebounded Canisius (3-1) 47-32 and turned 19 offensive boards to 21 second-chance points.
Stony Brook led 36-30 at halftime and pushed that lead to 54-43 behind a Dave Coley jumper with 11:18 left to play.
Coley finished with 14 points for the Seawolves, who led throughout despite shooting 39.7 percent (25 of 63) from the field.
Gonzaga has signed California transfer Jordan Mathews to a financial aid agreement for the 2016-17 season.
Coach Gilmore on CWS win: 'It's indescribable' Coastal Carolina head coach Gary Gilmore reflects on his 21 years as head coach and is proud of how far the program has come.
Two late June events provided a great start on the 2020 class and a look at some new 2019 talent.