Jason Mercer is a multi-instrumental Canadian

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

 musician playing double bass, electric bass, banjo and guitar.

He was a member of the alternative rock

Alternative rock

Alternative rock is a genre of rock music and a term used to describe a diverse musical movement that emerged from the independent music underground of the 1980s and became widely popular by the 1990s...

 band Bourbon Tabernacle Choir

Bourbon Tabernacle Choir

The Bourbon Tabernacle Choir were a Canadian alternative rock band that formed in 1985 in Toronto, Ontario. Their R&B-flavoured rock made them a mainstay on Canadian campus radio in the early 1990s, but the band never quite broke through to the mainstream....

 in the 1980s and 1990s. When that band broke up, Mercer joined Ani DiFranco

Ani DiFranco

Ani DiFranco is an American Grammy Award-winning singer, guitarist, poet, and songwriter. She has released more than 20 albums, and is widely considered a feminist icon.-Biography:...

's band and moved to NYC to study
double bass with Orin Obrien and Michael Moore.
He has appeared as a guest musician on albums by Ani Difranco, Rick Moranis, Ron Sexsmith, Utah Phillips, Jason Collett, Ana Egge, Matt Keating, Annie Keating, Luther Wright and the Wrongs

Luther Wright and the Wrongs

-History:The band began as a side project for Wright when he was a member of Weeping Tile. When that band amicably parted ways following their 1998 recording This Great Black Night, the Wrongs became Wright's primary band. The band membership has shifted a number of times since its inception...

...
and has appeared onstage with the likes of Feist, Norah Jones, The BareNaked Ladies, Rick Moranis, Coldplay, John Hiatt, Bob Dylan, Maceo Parker, Bill Frizell, Jesse Harris, Tony Scherr...
He has appeared on TV shows: David Letterman, Conan Obrien, Jay Leno, Sessions at West 54th, Jules Holland, Bravo, A&E, Live with Regis and Kelly...
He currently tours as a member of Ron Sexsmith's band and still resides in NYC.