Meet Our Preceptors


Scott Ashby, PharmD, MHA
Clinical/Staff Pharmacist

PharmD Creighton University 1999, PGY1 Internal Medicine St. Joseph Hospital/Creighton Medical Center 2000, Master in Health Administration University of Phoenix 2007
Clinical staff pharmacist – Yavapai Regional Medical Center, Prescott AZ
Assistant Director of Pharmacy – Yavapai Regional Medical Center
Interim Director of Pharmacy – Yavapai Regional Medical Center
Clinical Supervisor – St. Francis Hospital, Milwaukee W
Preceptor: Oncology/Hematology



Angela Brenner, R.Ph., Pharm.D.
Clinical Lead Pharmacist - PICU/Pediatrics/NICU/OB/Adult Oncology
Clinical Instructor: University of Wisconsin, University of Minnesota, Midwestern University, South Dakota State University, Southern Illinois University at Edwardsville
B.S. in Pharmacy, Butler University (1991)

Pharm. D., University of Kentucky (1996)
Started formal pediatric/neonatal clinical pharmacy services at Ministry Saint Joseph's Hospital in 1996, and now oversees these programs.
Special interests include teaching, pediatric intensive care pharmacology, and patient safety initiatives.


Michelle Brenner, Pharm.D., BCPS
Clinical Manager

Residency Program Director
BS in pharmacy, University of Wisconsin (1994), Pharm.D. University of Kentucky (1996), BCPS (2001), Clinical Instructor for University of Wisconsin, University of Minnesota, Concordia University and Midwestern School of Pharmacy.
Special interests include teaching, emergency and critical care medicine and perioperative pharmacology.


Brook DesRivieres, Pharm.D., M.S.
Pharmacy Manager

Primary Preceptor for the PGY1 longitudinal Practice Management Rotation
Primary Preceptor for the PGY2 longitudinal Medication Safety Rotation
Primary Preceptor for the PGY2 Local Operations Rotation
B.S. Physiology, Michigan State University
PharmD, University of Michigan
M.S. in Health-System Pharmacy Administration, The Ohio State University
PGY-1 Residency, Grant Medical Center (OhioHealth)
Special interests include public health preparedness, responsible pharmaceutical waste solutions, and process improvement.


Vanessa Freitag, PharmD,
Pharmacy Director for inpatient and outpatient pharmacy services at Ministry Saint Joseph’s Hospital and Ministry Our Lady of Victory Hospital.

She obtained her Doctor of Pharmacy degree from the University of Minnesota and has worked as a clinical pharmacist and clinical manager of clinical services prior to moving to Marshfield for the Director role. She is currently leading system-wide projects to improve standardization of pharmacy services for the Ministry Health Care system, including implementation of a system-wide Pharmacy and Therapeutics Committee structure. Vanessa sits on the system-wide Ministry Quality Council that has oversight for initiatives driven through Ascension Health Care pharmacy services. She is a Lean Six Sigma greenbelt and program director for the administrative residency in health-system pharmacy.


Justin Guthman, PharmD.


Stephanie Helgeson, Pharm.D.
Clinical/Staff Pharmacist

Pharm.D. from the University of Wyoming
Pharmacy practice residency at St. Joseph's Hospital, Marshfield, WI
Preceptor for the pediatrics rotation


Bre Johnson, PharmD
Clinical/Staff Pharmacist

PharmD from Butler University
Completed PGY-1 Residency at Wishard Health Services in Indianapolis, IN
Areas of interest: Trauma, intensive care and emergency medicine.


Ben Jung, Pharm.D., M.S., M.P.A.
Clinical Lead Pharmacist- Surgical Services

Pharm.D., Drake University (2007)
M.P.A. Master in Public Administration, Drake University (2007)
M.S. in Health System Pharmacy Administration, University of Kansas (2009)
Health System Pharmacy Administration Residency (PGY1/2), University of Kansas Hospital
Teaching Certificate, University of Kansas (2009)
Special Interests include; teaching, mentoring, medication safety and critical care medicine.


Ashley Lorenzen, PharmD
Clinical/Staff Pharmacist

PGY-1 Pharmacy Residency at Aurora BayCare Medical Center in Green Bay, Wisconsin
Pharm.D. from The University of Missouri-Kansas City School of Pharmacy in Kansas City, Missouri
B.A. Chemistry from William Jewell College in Liberty, Missouri
Special Interests include: teaching, mentoring, leadership, critical care, emergency medicine, oncology, and internal medicine


Debra Oldanie, PharmD
Clinical/Staff Pharmacist

PharmD., Purdue University (2012)
PGY1 Pharmacy Practice Residency, Ministry Saint Joseph’s Hospital (2013)
Special interests include nutrition support, pharmacokinetics, oncology, and infectious disease.


Megan Ose, Pharm.D.
Clinical/Staff Pharmacist

Pharm.D. from the University of Wisconsin-Madison
Interests include critical care, emergency medicine, pediatrics as well as volunteer work and community education .


Codee Marie Peterson, PharmD.

PharmD-University of Minnesota 2010
PGY1 and PGY2 in HealthCare Administration Resident
Ministry Saint Joseph’s Hospital
Marshfield, WI


Brian Ruppel, Pharm.D., BCACP


Karen S. Smith, R.Ph, MBA
Clinical/Staff Pharmacist

B.S. Pharmacy University of Connecticut
MBA in Health Care Administration from LaSalle University.
Residency in Drug Information, Fellowship in Antimicrobial Management at Hartford Hospital in Connecticut
Clinical Coordinator Abington Memorial Hospital, Pennsylvania prior to joining St. Joseph's Hospital in 2003.


Matthew J. Thill , Pharm.D.
Clinical/Staff Pharmacist

Pharm.D. from the University of Wisconsin-Madison
Completed pharmacy practice residency at Aurora Health
Care in Milwaukee, WI.
Preceptor for the Medical ICU rotation.


Tyler Van Schyndel, PharmD
Clinical/Staff Pharmacist

BS in Pharmacology-Toxicology from the University of Wisconsin, Madison (2007)
PharmD from the University of Wisconsin, Madison (2011)
Teaching Certificate from Concordia University (2012)
Completed PGY1 Residency Training at Froedtert Hospital in Milwaukee, WI and PGY2 Residency Training in Critical Care at the University of Wisconsin Hospital and Clinics
Preceptor for Critical Care Rotations
Special interests include teaching, learning, critical care, toxicology


Sara Weidert, PharmD
Clinical/Staff Pharmacist

PharmD – East Tennessee State University, Johnson City, TN (2012)
PGY1 – University of Tennessee Medical Center, Knoxville, TN
Special interests include critical care, emergency and infectious disease pharmacy.

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