Job Description. Job Description. We are a thriving private practice looking to expand our family. We currently have 3 locations in Fenton, Chesterfield and O'Fallon. Come check our website at. www.missouridermmd.com. and meet our providers. We are seeking a reliable medical assistant to fill an immediate opening. Work shifts will be scheduled primarily in our Fenton office location, with the possibility of occasional shifts as needed in our Ches...