| Mark R. Johnsen | |
|---|---|
| Born | Mark R. Johnsen October 8, 1962 Glenrock, New Jersey, U.S. |
| Occupation | Brewer |
| Years active | 1997–present |
Mark R. Johnsen is a US Army veteran and American brewer from Spartanburg, South Carolina. Johnsen is the founder of Spartanburg's first microbrewery, RJ Rockers Brewing Company.[1]