That's because he was sensational in helping guide his team to a prestigious 14-team, 7-on-7 tournament title in Palm Beach last weekend. For the tournament, the talented defensive back recorded five interceptions.
A virtual unknown before the event, Callendar clearly has established himself as one of the top safeties in Florida' Class of 2009.
"Best senior player at this event," Charles Fishbein of Elitescoutingservices.com told the Miami Herald. "I have watched every great safety in this state in this class, and he is top 5. He's that good."
"He's one of the top defensive backs/receivers in the state," Doral coach Evan Cooper said. "He's an all-purpose player. He'll run a 4.3 and he's probably got a 38 to 40 inch vertical. He's got great size and he's a very heads up football player."
Though he's still waiting for his first scholarship offer, Florida, Clemson, Syracuse, Purdue, Louisville, Kentucky and Kansas State have jumped into the mix early with Callendar.
"I've had a lot of college coaches recently that are trying to get in contact with me," Callendar said. "That 7 on 7 tournament helped me get a lot of looks. Now people are talking about me being one of the top safeties in Florida. It feels good."
Not only is Callendar a top prospect on the gridiron, he's also a solid student in the classroom with a 3.3 GPA. He's set to graduate from Doral Academy in December and he's looking for a program where he can enroll early and make an impact quickly.
"The biggest thing for him is that he's going to graduate in December so he can be in spring ball when the time rolls around," Cooper said. "He's set academically and he's an impact player. He's the type of player that can go in and compete for a starting position in spring ball in 2009."
So which schools is Callendar hoping for offers from?
"I like Florida, LSU, Georgia and Clemson," Callendar said. "Louisville has been writing a lot of letters but I haven't really heard anything more from them. I've got a lot of interest in Louisville. I'm really interested in everybody. I just really want to go to college."
"Louisville has as a good a chance as anybody else," added Cooper. "He has to decide if he wants to stay in-state or leave the state."
Callendar should expect to start seeing some offers come his way. His plan is to sit back, wait for some offers and then take some visits before making a decision this fall.
"I'm going to encourage him to take as many visits as he can and work from there," Cooper said.