2025-26: Played and started in all 31 games for Yale…Second Team All-Ivy Honoree…Tallied 24 games with double-digit points with six double doubles…Ranked second on the team in points per game (13.2 ppg), rebounds (195), and assists (99)…Kicked off the season with four straight games with double-figures…Had 16 points, five rebounds, and three assists at Vermont…Notched 13 points with seven rebounds and three assists at home against UIC….Notched his first double double of the season with 14 points and a career high 10 assists at home against Cornell…Tallied 12 points, 12 rebounds, and six assists at Penn…Had a strong performance with 17 points, a career high 14 rebounds and went 9-of-12 from the free throw line in a thrilling overtime victory at Harvard…Had a performance to remember in the Ivy Madness semifinal against Cornell with a career high 27 points on 12-of-16 shooting with six rebounds…Tallied 17 points on 6-of-13 shooting with 11 rebounds in the Ivy Madness Championship against Penn…Paced the Bulldogs with 23 points on 8-of-13 shooting, including 4-of-5 from deep with 12 rebounds and five assists in the NIT First Round against UNCW.

2024-25: Played in all 30 games for the Bulldogs…Recipient of the John C. Cobb Team Award...Averaged 7.1 points per game and 5.0 rebounds per game…Tabbed Ivy League Rookie of the Week on Feb. 17…Had a strong collegiate debut vs. Quinnipiac with 18 points on 6-of-8 shooting with eight rebounds…Tallied double-figures in seven games…Chipped in with nine points on 3-of-5 shooting in Ivy Championship game vs. Cornell…Had a strong showing in the NCAA First Round game against Texas A&M with 12 points on 5-of-6 shooting…

High School: Scored 1,927 points at Winter Haven High School, the second most in school history… Two-time All-State selection, including first team honors as a senior… Back-to-back Polk County Player of the Year… Two-time Kingdom of the Sun Tournament MVP… Averaged 21.5 ppg., 9.2 rpg., 5.0 apg and 1.3 blocks per game… Grabbed a school record 1,060 rebounds in his career… Helped Winter Haven advance to the state championship game and win three regional championships and two district titles.
 
AAU: Played for 1Family Hoops.
 
Personal: Older brother Joshua Celiscar plays football at Texas A&M after transferring from Central Florida… Older brother Donald Celiscar played professional football with the Indianapolis Colts and in Canada and is currently a defensive back coach at Western Michigan, where he played as an undergraduate… Volunteer with Hoops Haven Youth Program.
 
Why Yale? “Because I love the culture and I’ll be getting the best of both worlds academically and athletically. On my official visit, I felt Yale was the place I wanted to be. I liked the team, I liked the diversity and the cultural differences.”
 
Jones on Celiscar: “Isaac is a combo forward from a winning high school program. He’s extremely competitive and plays with a great deal of confidence.”