St. John's For Providers Medical Staff Services Office Staff Medical Staff Services Office Staff Resources for Medical Professionals We are located on the first floor of the hospital (east side) in Room 1K33. Office hours are 8 am - 4:30 pm, Monday - Friday. (217) 757-6161 or Fax (217) 525-5673 Gurpreet Mander, MD, MBA, CPE Chief Medical Officer Breanna Nagel Medical Staff Office Manager Kristen Flowers Credentialing Specialist Tammy Caspar Administrative Assistant Sara Cameron, CPCS, CPMSM CID Medical Staff Services Director Tisa Andruskevitch Credentialing Specialist Melessia Jordan Credentialing Specialist