He was the son of Christophorus Adam Krauss, a physician at the court of Prince Hohenlohe, and Dorothea Zolner.
[1][2] He is best known for his publication "Afbeeldingen der fraaiste, meest uitheemsche boomen en heesters".
After initial tuition by his father, Johan served for a period as soldier and later resumed his studies in Erlangen and Stratsbourg, and upon completing these was appointed as physician to the Baden troops, who were stationed in Holland at the time.
In May 1807 he was appointed as professor of theoretical, practical and forensic medicine at Harderwijk, and the following year held an 'Oratio de medicina systematica, eiusque usu ac abusu' (An oration on systematic medicine, and its use and abuse).
In June 1810 he stepped down as rector and presented 'De perscrutatione mentis humanae maximum medico faciente emolumentum' (the investigation of the human mind, the greatest contribution made by the physician), in which he urges physicians to practise therapy.