T-John Casiello founded Casiello Basketball in 2016 and has since trained athletes from across the world at every level—from youth players to NBA professionals such as Jordan Hall, Nik Stauskas, Ryan Arcidiacono, and Lance Thomas. His passion for player development began while working with Sport Changes Life & the Rory McIlroy Foundation in Ireland, where he coached teams, ran clinics, and led individual sessions. Over the years, T-John has conducted clinics in 10 different countries, sharing the game globally while continuing to grow the sport. He later coached and trained in Spain while also competing professionally. Today, T-John works with many of the region’s top players and leads a program built on growth, discipline, and high-level skill development.

Before coaching full-time, T-John enjoyed a successful playing career at every level. At NCAA DII University of the Sciences, he was a four-year starter, NCAA Tournament participant, and ranked 4th in school history for assists while earning multiple academic and athletic honors. His professional career included stints in Ireland and Spain, where he finished among league leaders in scoring and assists. A 1,000-point scorer and First Team All-South Jersey selection at Wildwood Catholic, T-John went on to earn a Master’s in Marketing from Letterkenny IT in Ireland after completing his undergraduate degree in Pharmaceutical and Healthcare Business.