 In 1613, Johann Philipp was appointed Dean of the University of Leipzig.Also, he was an active member of the Fruitbearing Society.In 1638, he received the towns of Coburg, Bad Rodach, Römhild, Hildburghausen and Neustadt, according to the divisionary treaty between him and the branch of Saxe-Weimar after the death of the duke John Ernest of Saxe-Eisenach without surviving issue.