Mas Missur was a Jedi Master. He fought for both the Jedi Order and the Galactic Republic as a General within the Grand Army of the Republic during the Clone Wars.
Having been trained by the Jedi Order as a Force-sensitive in the ways of the Force, Mas Missur rose to the position of Jedi Master by the time the Separatist Crisis was causing problems for the Galactic Senate. When the Clone Wars began between the Republic and the Confederacy of Independent Systems, Master Missur became a Jedi General in the newly formed Grand Army of the Republic, commanding clone troopers in battles against the Separatist Droid Army across various battlefields.
When the Republic instigated a rebellion on the planet of Gaftikar, Master Missur was given the responsibility of leading the Acclamator-class assault ship named Leveler to that world to offer support against a CIS invasion. By aiding the Marit population, Missur and the 35th Infantry were able to successfully secure the planet's mineral resources for the planet's inhabitants.