He is the co-lead singer for the alternative rock band Guster playing guitar, piano and bass.

He grew up as an only child and was raised in Dallas, Texas, graduating from Berkner High School in 1991,[1] where he had his own band, the Silents.

Ashley Pérez Flanagan, Pomme Koch, Rohan Kymal and John-Michael Lyles round out the cast.

[14] In 2021, Miller launched a Substack newsletter called Weird And Wonderful World where he writes about sandwiches, tiny museums, haunted houses, art installations and other weird/wonderful places and things.

[15] In the fall of 2023, Miller starred in Brian Brightly's feature-length dark comedy The Wake alongside Michael Chernus, Rob Yang, Ross Partridge and Julia Randall.