|No. 4 – Montakit Fuenlabrada|
October 20, 1986|
|Nationality||American / Irish|
|Listed height||6 ft 7 in (2.01 m)|
|Listed weight||220 lb (100 kg)|
|College||Saint Mary's (2005–2009)|
|NBA draft||2009 / Undrafted|
|2009–2010||Ciudad de Vigo|
|Career highlights and awards|
O'Leary started his professional career with Ciudad de Vigo Básquet, finishing in the last position of the 2009–10 LEB Oro season. One year later, he signed for Oviedo CB of the LEB Plata. He performed 16.0 points and 9.5 rebounds per game and was claimed as MVP of the 2010–11 season. before making his debut in Liga ACB with Blancos de Rueda Valladolid. He only stayed the 2012–13 season with the Castilian team before signing with Herbalife Gran Canaria.
In April 2015, he played the 2015 Eurocup Finals with the Canarian team.
- Un MVP para Palencia Baloncesto; Baloncestoconp.es, 29 July 2011
- El Blancos de Rueda incorpora al estadounidense Ian O'Leary; Marca, 28 August 2012