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Leadership & Staff:

Name & Title Biography Contact Info

Daniel L. Gustafson, PhD


Dr. Gustafson is responsible for policies, procedures, personnel, budget, equipment, reports and Cancer Center meetings. He has directed the Pharmacology Shared Resource since its inception and plays a role in study planning, method development, analysis and modeling of data.
Dr. Gustafson is an expert in PK/PD modeling and analysis and is an author on many publications as he spends his research time as well as his shared resource time on these studies.


Ryan J. Hansen, PhD


Dr. Hansen is responsible for day-to-day operations and quality control within the PharmSR as well as assisting in assay development, conducting animal studies and sample analysis. In addition, Dr. Hansen interprets data and prepares data summaries, invoices, and collaborative portions of final manuscripts.  He is also involved in study planning and budgeting, providing quotes, and preparing relevant sections of grants to support SR users. He has been associated with the Shared Resource since 2006 and has become experienced in LC/MS/MS analysis through on the job training by Dr. Gustafson and Dr. Joseph Zirrolli as well as through on-site training by Applied Biosystems (Christopher Borton, ABI Field Application Specialist).


Luke A. Wittenburg, DVM, PhD, DACVCP

Assistant Professor – Veterinary Clinical Pharmacology


Dr. Wittenburg assists in analysis and modeling of PK/PD data as well as assisting in assay development and sample analysis. He became associated with the PharmSR in 2010 as a post-doctoral fellow and resident.  He is a board-certified Veterinary Clinical Pharmacologist with extensive training in study design and translational/comparative clinical pharmacology, with experience in the design and conduct of veterinary oncology clinical trials and pharmacokinetic studies in pet animals.  Dr. Wittenburg is responsible for the implementation of methodology for targeted proteomic studies utilizing HPLC-MS/MS analysis of signature peptides in biological samples.


Paul J. Lunghofer, MS

Sample Analyst

Paul has worked in the PharmSR since 2009 and has become experienced in LC/MS/MS analysis through on the job training by Dr. Gustafson and Dr. Hansen. Currently, he is responsible for a majority of sample preparation and analysis as well as method development and validation.