Fellowship, Department of Pharmacology and Toxicology, University of Buffalo (1999)
Senior Associate Dean for Research, School of Dental Medicine, University at Buffalo (2022-present)
Adjunct Research Professor of Oncology, Head & Neck/Plastic & Reconstructive Surgery, Roswell Park Comprehensive Cancer Center (2020-present)
Consulting Scientist, Roswell Park Comprehensive Cancer Center, Department of Head/Neck Surgery (2020-present)
Centennial Endowed Professor, School of Dental Medicine, University at Buffalo (2019-present)
Program Member, Tumor Immunology and Immunotherapy Research Program, Roswell Park Comprehensive Cancer Center (2018-present)
Professor, Oral Biology, University at Buffalo (2017-present)
Interim Chair, Periodontics and Endodontics, University at Buffalo (2021–2022)
Attending Periodontist, Western NY VA Medical Center (2020–2022)
Associate Dean, Innovation and Technology Transfer, University at Buffalo (2019–2021)
Consulting Physician, Oral Oncology, Roswell Park Comprehensive Cancer Center (2018–2020)
Consulting Physician, Roswell Park Comprehensive Cancer Center, Department of Oral Oncology (2018–2020)
Adjunct Professor, Bioengineering, Clemson University (2010–2017)
Adjunct Professor, Microbiology and Immunology, Medical University of South Carolina (2010–2017)
Professor, Oral Health Sciences, Medical University of South Carolina (2010–2017)
Chair, Oral Health Sciences, Medical University of South Carolina (2010–2017)
Associate Dean for Research, College of Dental Medicine, Medical University of South Carolina (2008–2017)
Associate Professor, Microbiology and Immunology, Medical University of South Carolina (2008–2010)
Associate Professor, Oral Health Sciences, Medical University of South Carolina (2008–2010)
Founding Chair, Oral Health Sciences, Medical University of South Carolina (2008–2010)
Private Practice Limited to Periodontics, Great Expressions Specialty Practice (2006–2008)
Associate Professor, Periodontics and Oral Medicine, University of Michigan School of Dentistry (2007)
Assistant Professor, Periodontics and Oral Medicine, University of Michigan (2004–2007)
Research Assistant Professor, Pharmacology and Toxicology, University of Buffalo (2002–2003)
Assistant Professor, Periodontics And Endodontics, University of Buffalo (2000–2003)
Private Practice Limited to Periodontics, Barzman, Kasimov, and Vieth (1998–2000)
Clinical Assistant Professor, Periodontics, University of Buffalo (1997–2000)
Clinical Assistant Professor, Oral Biology, University of Buffalo (1997–1999)
Post Doctoral Fellow, Pharmacology and Toxicology, University of Buffalo (1997–1999)
Clinical Instructor, Periodontics And Endodontics, University of Buffalo (1995–1997)