Born and raised in Fort Collins, Colorado, USA, D'Agostino started singing, acting, and performing in theater when he was eight years old.

[1] D'Agostino has appeared in commercials and television shows including CSI, Weeds, CSI: Miami, Veronica Mars, Malcolm in the Middle, Without a Trace, Good Morning, Miami, JAG, Judging Amy, Phil of the Future, MDs, The Brothers Garcia, and Medical Investigation.

He was recognized for his standout performance as a series regular on David E. Kelley's The Brotherhood of Poland, New Hampshire (CBS) with co-stars Randy Quaid, Elizabeth McGovern, John Carroll Lynch, Ann Cusack, and Chris Penn.

[1] D'Agostino landed his first lead role in a feature film in 2002, playing the character Joshua "Toast" in Mary-Kate and Ashlee Olsen's Getting There.

starring Ben Feldman (Mad Men, Silicon Valley,) Pound of Flesh with Malcolm McDowell, The Sasquatch Gang (2006) by the creators of the cult classic film Napoleon Dynamite with cast mates Justin Long, Joey Kern, and Jon Heder, and indie-horror film Underground (2011) with co-stars Christine Evangelista and Sofia Pernas.

After recording at Rock Mafia Studios in Santa Monica, CA, D'Agostino formed the live band with several friends.

Oekiin's song "All Together" was released August 16, 2019 on Illenium's third album, "Ascend," distributed by label Astralwerks/Capitol Records/Universal Music Group.