Professional Experience
 

2008-present	Assistant Head School of Health Sciences
2008-present	Director, Graduate Radiological Health Sciences Program
2006-present	Associate Professor (tenured). Purdue University School of Health Sciences.
2006-present	Director, Undergraduate Radiological Health Sciences Program
2003-2006	Assistant Professor (courtesy). Oregon State University Nuclear Engineering and Radiation Health Physics.
2002-2006	Assistant Professor (tenure track). Purdue University School of Health Sciences.
1997 - 2002	Senior Scientist. Radiation and Biophysics Research, Pacific Northwest National Laboratory
Summer 1998	Adjunct Faculty. Math Department, Columbia Basin College.
1990 - 1993	Research Scientist. Dosimetry Research and Technology, Pacific Northwest National Laboratory.

Teaching (Received the 2005 and 2006 Robert R. Landolt Teaching Award, Nominated for the Murphy Teaching Award in 2004, 2005, 2006 and 2008)

• HSCI 101 Introduction to the Health Sciences Professions (Guest lecturer)
• ENGR 103 Introduction to Engineering Careers (Guest Lecturer)
• HSCI 312 Radiation Science Fundamentals (Instructor)
• HSCI 540 Radiation Biology (Instructor)
• HSCI 590A Special Topics: Radiological Emergency Management (Co-Instructor)
• HSCI 590B Special Topics: Computational Methods in Radiological Science I (Instructor)
• HSCI 590C Special Topics: Computational Methods in Radiological Science II (Instructor)
• HSCI 690B Medical Physics Laboratory (Instructor)

Mentoring
Faculty Advisor for the Purdue Branch of the Health Physics Society (PBHPS)

• Undergraduate
• Graduate students
• Post-doctoral research associates

Grants

• Nuclear Engineering and Health Sciences Scholarship Support Program at Purdue University , Nuclear Regulatory Commission (NRC), T. Jevremovic (NUCL) and R.D. Stewart (HSCI), Co-Principal Investigators. 2008-2009

• Service-Learning Faculty Development Grant, Purdue University 2007-2008

• Monte Carlo Simulation of 90Y Microsphere Deposition in the Vasculature of Normal and Malignant Liver Tissue.  Summer Faculty Grant, Purdue Research Foundation, R.D. Stewart, Principal Investigator. May-August 2007.

• Towards Constructing and Testing a Virtual Tissue. Office of Science (BER), U.S. Department of Energy, Grant DE-FG02-03ER63665.  R.D. Stewart, Principal Investigator. September 2003-August 2006.

• Kinetic Modeling of Damage Repair, Genome Instability, and Neoplastic Transformation. Office of Science (BER), U.S. Department of Energy, Grant DE-FG02-03ER63541.  R.D. Stewart, Principal Investigator. October 2001 - December 2005.

• Molecular Energetics of Clustered Damage sites. Subcontract from Pacific Northwest National Laboratory.  January 2003 - August 2005 (Subcontract is associated with a larger DOE Office of Science project of the same name. M. Dupuis, Principal Investigator).

Professional Affiliations

• American Association of Physicists in Medicine
• American Nuclear Society
• Health Physics Society
• Radiation Research Society.  Physics Councilor (2005-2008) and member of the Constitution and By-Laws Committee (2004-2005).  Associate Editor for the journal Radiation Research (2007-2011).

Selected Presentations (complete list)

• RD Stewart, Monte Carlo Simulation of the Effects of Oxygen on Clustered DNA Lesions Formed by Ionizing Radiation (pdf). Presented at the Symposium: Stochastic Track Models (M. Dingfelder and R. Stewart, chairs) 54th Annual Meeting of the Radiation Research Society, Boston, MA, September 22, 2008.

• RD Stewart, Effective Treatment Planning with Imperfect Models and Uncertain Biological Parameters (pdf). Presented at the Symposium: Translating Physics and Biology into the Clinic (R. Stewart and J. Deasy, chairs) 54th Annual Meeting of the Radiation Research Society, Boston, MA, September 23, 2008.

• RD Stewart, Biologically Guided Radiation Therapy (BGRT).  Invited presentation, 3rd annual McGill Workshop on Monte Carlo Techniques in Radiotherapy Delivery and Verification, McGill University, Montreal, Canada, May 29-June 1, 2007.

• VA Semenenko and RD Stewart, Effects of intercellular signal-mediated cell death and neoplastic transformation on transformation frequency at low doses of ionizing radiation.  Oral presentation and poster presented at the 53^st Annual Meeting of the Radiation Research Society in Philadelphia, Pennsylvania, USA, November 5-8, 2006.

• R.D. Stewart. Induction, Repair and Biological Consequences of Clustered DNA Lesions. Continuing Education Lecture (CEL-8), 51st Annual Meeting Health Physics Society. Providence, Rhode Island, June 25-29 (2006).

• R.D. Stewart and R.K. Ratnayake. Implications of intercellular signaling for the shapes of dose-response relationships.  DOE Low Dose Program Workshop V, Washington DC, April 25-27, 2005.