Studio J the graphic design firm of Jeri Johnston. Located in Marin County, California, Jeri Johnston (now Jeri Ireland) has recently decided to focus most of her attention on fine art. ,     Jeri Johnston, sometimes spelled Jerry Johnston, Jeri Johnson, or Jerri Johnson, but Jeri Johnston is correct. Studio J is located in Novato, in the North Bay Area of Marin County, California and specializes in web design, print design and illustration