Ramirez trained as a musician at Douglas Anderson School of the Arts in his native Jacksonville, Florida. Sudano spent summers touring the world as a backing singer for her mother Donna Summer.
Ramirez and Sudano first met after Sunday service at a church in Nashville, Tennessee. Four years later Sudano attended a songwriting workshop held by Ramirez and became interested in writing songs with him.
The pair formed a songwriting partnership and called themselves Johnnyswim. The inspiration for the name of the duo came from the scene in the classic movie Jaws when a character named Johnny is attempting to flee from the shark as his friend shouts from the pier, "Swim, Johnny, swim!"
Johnnyswim regularly perform new material for the New Music Mondays installment on their official YouTube Channel. The duo also cover songs by a range of artists like Edith Piaf and Britney Spears.
Sudano and Ramirez were married in 2009.
Johnnyswim released their first self-titled EP on June 30, 2008.
In 2009, the duo collaborated with Bruce Sudano on the track Morning Song which appeared on his record Life and the Romantic.
2011 saw the release of the single Bonsoir. In September that year, the duo travelled to India with VisitingOrphans.org. Inspired by their experiences there, they wrote the track Hallelujah which was released in December 2011 with 100% of the profits going to the efforts of the charity.
April 24, 2012 saw the release of Home, Vol. 1 a new collection of songs as well as the release of the single Annie.
Johnnyswim were guests on the November 17, 2012 broadcast of the live radio variety show, A Prairie Home Companion