Meet Our Preceptors

Sean Byers, PharmD, BCPS earned his PharmD from Creighton University in 2014.  Upon graduation, he moved to Milwaukee where he completed his PGY-1 inpatient pharmacy practice residency at Aurora St. Luke’s Medical Center.  He is currently a clinical pharmacist at Ascension St. Francis Hospital and is a co-preceptor for the Emergency Medicine rotation.  He is a member of both the American Society of Health-System Pharmacists and the Pharmacy Society of Wisconsin. 

Deb Byzewski, PharmD received her Bachelor of Science in Pharmacy from the University of Wisconsin-Madison School of Pharmacy in 1991 and her Doctor of Pharmacy from the University of Illinois at Chicago School of Pharmacy in 2002.  She completed a pharmacy practice residency (PGY-1) at Children’s Hospital of Wisconsin in 2003.  She is a member of the American Society of Health-System Pharmacists and the American College of Clinical Pharmacy.  Her practice interests include pediatrics, neurology and investigational drug services.

Andrew Ensing, PharmD – Andrew Ensing, PharmD, earned his Bachelor of Science in Biology from for Indiana University-South Bend in 2010 and his PharmD from the University of Wisconsin-Madison in 2014.  He practices as one of the TPN pharmacists with cross training in oncology /ED. His clinical interests include: TPN, infectious disease, pharmacokinetics, mental health, and oncology.  He is a member of the American Society for Parenteral and Enteral Nutrition.   Currently, he precepts the central pharmacy rotation.  He plans to obtain his board certification in pharmacotherapy or clinical nutrition in the next few years.  In his free time, Andrew enjoys spending time with his family, ice-fishing, and winemaking.

Mike Gillard, PharmD, BCPS received his B.S. in Pharmacy from the University of Wisconsin-Madison in 1993, completed a PGY-1 Pharmacy Practice Residency at the University of Wisconsin Hospital and Clinics in 1994, and earned his Pharm.D. from the University of Wisconsin-Madison in 1996.  He became board certified as a Pharmacotherapy Specialist in 1997 and currently holds that distinction through 2025.

Mike has worked in both clinical and leadership pharmacy positions, most recently as the Inpatient Pharmacy Manager for Ascension SE Wisconsin Hospital – Franklin Campus since 2008.  From 1999 to 2002, Mike served as a preceptor, primary preceptor and Residency Program Coordinator for the PGY-1 Pharmacy Residency Program at Aurora Health Care.  Mike also served as acting Pharmacy Residency Program Director for the PGY-1 Pharmacy Residency Program at Wheaton Franciscan - St. Joseph’s Campus from 2011 to 2013.  Mike was a United States lead in the Medication Reconciliation project, a component of the High 5s initiative; a project sponsored by the World Health Organization, Agency for Healthcare Research and Quality, The Joint Commission, and Joint Commission International which seeks to improve patient safety around the world.

Mike is a member of the American Society of Health-System Pharmacy and the Pharmacy Society of Wisconsin, serving on the board as Region F Director from September 2014-2018, and most recently elected as President of the Pharmacy Society of Wisconsin.  His areas of interest include medication policy and safety, pharmacy informatics, and advancement of hospital pharmacy practice through leadership, staff development, and pharmacy resident and student education.  To date, Mike has been a preceptor to over 900 students and residents.

Rustin Groskreutz, PharmD, BCCCP earned a B.S. in Pharmacology and Toxicology from the University of Wisconsin-Madison in 1999 and a PharmD from the University of Wisconsin-Madison in 2002. He has 13 years of clinical practice experience focusing in critical care medicine.  He is currently one of the critical care pharmacists at Ascension St. Francis Hospital in Milwaukee.

Phillip Guyer, RPh

Christa Hatch, PharmD, BCPS earned a Bachelor of Science in Biomedical Sciences from Marquette University in 2009 and a Doctor of Pharmacy from the University of Wisconsin-Madison in 2013.  She completed a PGY-1 pharmacy residency at Froedtert Hospital and is currently a pharmacist at St. Francis Hospital.  She is a member of the American Society of Health-System Pharmacists and the Pharmacy Society of Wisconsin.  Her areas of interest include geriatrics and informatics.

Michelle Hayek, PharmD, BCOP earned a Bachelor of Science degree in Biomedical Sciences, with a minor in criminology from Marquette University in 2002, and went on to earn a Doctor of Pharmacy degree from St. Louis College of Pharmacy in 2006.  After graduation, she completed a PGY-1 residency from Clement J. Zablocki VA Medical Center in Milwaukee in 2007.  After graduation, she worked in various aspects of pharmacy, including inpatient clinical pharmacist, pharmacist in charge of Aurora and Wal-Mart pharmacy, and, most recently, ambulatory oncology pharmacist at Ascension St. Francis Medical Center.  She has been a pharmacist specializing in oncology since 2011, and completed her Board Certification in Oncology Pharmacy in October 2015.

Nadir Hinnawi, PharmD, BCCCP earned his Doctor of Pharmacy degree from the University of Wisconsin - Madison in 2007.  He worked as a clinical pharmacist at Aurora St. Luke’s Medical Center in Milwaukee (2007-2010) and St. Joseph hospital in Milwaukee (2010-2017).  His primary focus was providing inpatient clinical pharmacy services in the intensive care units.


Currently, Nadir has been employed at St. Francis hospital in Milwaukee as the lead clinical pharmacist focusing half of his time operating as a clinical manager and the remaining half of the time providing decentral staffing in the intensive care unit.  Nadir co-precepts the ICU and administration rotation for PGY1 pharmacy residents.  He continues to serve as a clinical instructor for both IPPE and APPE students for both UW-Madison and CUW School of Pharmacies.

Kristin Klarenbeek, PharmD earned her Bachelor of Arts degree in Biology and Spanish from Augustana University (Sioux Falls, SD) in 2014 and her Doctor of Pharmacy from the University of Iowa College of Pharmacy in 2018.  She then completed her PGY-1 inpatient pharmacy residency at Ascension St. Francis in 2019 and is currently pursuing board certification in pharmacotherapy.  She is a clinical pharmacist at Ascension St. Francis, staffing mainly in the Emergency Department and is a co-preceptor for the Emergency Medicine rotation.  Kristin is a member of the American Society of Health-System Pharmacists and the Pharmacy Society of Wisconsin.  Her clinical areas of interest include emergency medicine, critical care, and infectious disease.

Karri Kuehn, PharmD earned her PharmD from Concordia University of Wisconsin in 2016. She obtained her Antimicrobial Stewardship Certificate from SIDP in 2017.  She is currently a clinical pharmacist and the Antimicrobial Stewardship point pharmacist at Ascension St. Francis Hospital.  She is also the site preceptor for the Infectious Disease elective rotation.  She plans on obtaining her BCPS in the fall.  Her clinical interests include infectious disease, cardiology, and internal medicine.  In her free time, Karri enjoys spending time with family and kickboxing.

Meghan Learned, PharmD earned her Doctor of Pharmacy degree from the University of Wisconsin-Madison School of Pharmacy in 2015.  After graduation she practiced as a hospital pharmacist for one year before completing her PGY1 inpatient pharmacy residency at Ascension St. Francis Hospital.  She is currently a co-preceptor for the internal medicine rotation.  Her clinical interests include internal medicine, critical care, and medication safety.

Benjamin Scott, PharmD, BCPS earned his PharmD from the University of Wyoming in 2013.  He then went on to complete a PGY1 pharmacy residency at Wheaton Franciscan – St. Joseph Campus in Milwaukee, Wisconsin.  He received his board certification in Pharmacotherapy in 2014.  He is currently a clinical pharmacist and residency program coordinator at Ascension St. Francis Hospital in Milwaukee where he also serves as the primary cardiology preceptor.  Ben’s primary practice area is on the cardiac-telemetry floor; his other practice areas include ICU, ED, and central pharmacy.  Ben is a member of the American Society of Health-System Pharmacists and the Pharmacy Society of Wisconsin.  His clinical areas of interest include: management of venous thromboembolism, advanced heart failure management, cardiac core measure compliance, critical care, antimicrobial stewardship, and drug policy development.