Medical-Legal Research Expert Witnesses: 17

• Neurological Injuries (Brain and Spinal Cord Injury)
• Burns
• Orthopedic Injures
• Amputation
• Chronic Pain
• Post Traumatic Stress Disorder

• Expert Testimony
• Life Care Planning
• Mini/Preliminary Life Care Plan
• Video Services
• Medical Record Review
• RN Independent Medical Exam
• Medicare Set Aside Trust Analysis
• Medical Bill Auditing
• Questions: Deposition Cross Examining

Dr. Pia Quimson-Guevarra is Board-Certified in Psychiatry and Forensic Psychiatry by the American Board of Psychiatry and Neurology. She has expertise in psychiatric issues in civil litigation, employment matters, and criminal cases. She also has additional and extensive experience with diagnosis and treatment of depression, anxiety, bipolar disorder, and severe psychotic disorders both as a treating physician and as possible features in a medical-legal case as a forensic consultant. Psychiatric conditions can impact judgment, clarity of thought, and even criminal responsibility. In the case of psychotic disorders, symptoms may include hallucinations and delusions. She opines about medication or drug impact on behavior.

Dr. Pia Quimson-Guevarra has conducted over 20 competency assessments: competency to stand trial and criminal responsibility evaluations. She is a Certified Forensic Evaluator in Oregon.

Her work is divided between clinical and forensic/expert witness work. Dr. Quimson-Guevarra conducts medical and legal records review as a Forensic Psychiatrist, and medico-legal Independent Medical Evaluations by video and face-to-face, as appropriate. Her assessments are thorough and inform thoughtful and objective expert opinions issued by written report and testimony

Dr. Quimson-Guevarra has a clinical practice, Quimson Behavioral Health, providing psychiatric patient care, medication management, and psychotherapy, for patients who suffer from mental disorders such as Anxiety, Depression, ADHD, and PTSD. She is based in the greater Portland, Oregon Metropolitan Area.

At Cascadia Behavioral Healthcare, Dr. Quimson-Guevarra worked on an Assertive Community Treatment (ACT) team, a method to deliver an intensive level of services to patients in the local community. Her patients consisted of individuals who suffer from severe and persistent mental illness. Her expertise in treatment of Bipolar Disorder and Schizophrenia is applied to patients with these medical conditions. At Cascadia, she also treated patients with a history that includes forensic medical-legal issues.

Previously, Dr. Quimson-Guevarra treated patients who suffered from anxiety, mood, and psychotic disorders at Cedar Hills Hospital, Multnomah County Detention Center, Washington County Jail, Snake River Correctional Institute, and the Portland Veteran's Administration.

She continues to use her expertise in psychopharmacology to treat mental health conditions in the context of medically complex cases.

Dr. Quimson-Guevarra has served as a forensic consultant for the Washington County mental health court in Oregon. She also has worked in the forensic evaluation service department at the Oregon State Hospital where she performed competency to stand trial and criminal responsibility evaluations to patients at the Oregon State Hospital or defendants located in various jails.

The Physician Assistant Experts Network™ is a referral resource for attorneys seeking expert medical opinions on the standard of care provided by physician assistants and advanced nurse practitioners. The PA Experts Network™ was founded by Jeffrey G. Nicholson, PA-C, Ph.D., M.Ed., MPAS, an experienced medical-legal consultant and a leader in the physician assistant profession. He will either help you personally or facilitate a physician assistant expert from his network of board certified Physician Assistant Experts in all medical specialties. See his article on this website. Practicing 30 years, a PA Educator, Assistant Professor, and Director of the University of Wisconsin Physician Assistant Program.

Services Include:

• Medical Records Review, Deposition, Testimony, Referrals of PAs, NPs, Midwives, CRNAs, and allied health PT, EMT etc.

Education and Certifications:

• Ph.D., University of Wisconsin-Madison, WI, 2008
• Master of Education, M.Ed., Harvard University, Cambridge, MA, 1989
• Masters Degree in Physician Assistant Studies, University of Nebraska Click here for Website to see complete resume and photo.

Georgia J. Persky RN, MBA, PhD, CLNC, CNOR is a Columbia University trained nurse researcher with over 40 years of broad Clinical Nursing experience and 25 years of senior leadership in Hospitals, Nursing Homes and Home Health organizations. She also has 20 years of Surgical Nursing and Operating Room experience. Dr. Persky has expertise in the micro issues in nursing for adult patient care and the broad management, quality, and regulatory issues in hospitals. 

Background Experience - Dr. Persky served as Vice-President of Nursing and Patient Care Services for the past 25 years and most recently at New York Presbyterian Hospital/Columbia University Medical Center. For nine years, she was responsible for Patient Care Services, Risk and Quality Management and Patient Satisfaction for a 750-bed academic hospital. She directed a $200 million budget with 33 patient care units and Care Management, Respiratory Therapy, Social Work and Admitting Departments with 9 direct reports and 2,000 patient care employees.

Litigation Support - As a Certified Legal Nurse Consultant and Quality Reviewer, Dr. Persky has investigated hundreds of Malpractice and Injury cases as a quality reviewer and can assist in legal case review with chronologies, timelines, and evidence-based reports. She has testifying experience in malpractice and personal injury cases, as well as, with human resource and employee discrimination with an ability to attest to standards of care in clinical litigation. Dr. Persky's services are available to attorneys for the plaintiff and defense seeking an expert in nursing and patient care with a strong understanding of how heath care organizations work.

Areas of Expertise:

View Dr. Persky's Consulting Profile.

Dr. Patricia J. Bartzak, DNP, RN, CMSRN, TCRN, CNRN is a skilled hospital nurse clinician with 19 years of direct nursing care of patients with infectious diseases and trauma patients, including injuries and diseases related to neurologic, cardiac, renal, renal transplant, spinal, orthopedic and acute and chronic pain and oncologic diagnoses.  Located on the east coast with current nursing licenses both in Massachusetts and California. Has reviewed more than 60 cases in 6 years, written several reports, and been deposed about a dozen times in person and video. Currently working in a hospital designated as level-1 trauma center.

Continued active contributions to the field of nursing as staff nurse, nurse researcher, professional journal column editor and leadership initiatives through active participation in professional nursing organizations.  Served 2 terms as an elected Regional Coordinator for Sigma Theta Tau, the nursing honor society. Currently, serving on the Board of Directors for the Academy of Medical-Surgical Nurses. 

Direct care experience with complex airways, cervical instability, multi-drain management, invasive monitoring, complex wounds, pain management and surgical interventions from many services: orthopedics, neurology, general surgery, thoracics, infectious disease and gastrointestinal medicine. 

Co-chaired the American Nurse's Association (ANA) Scope & Standards of Practice (4th edition, 2021), a document that guides nursing practice for the country's 4 million nurses and Chair of Nursing Research in a level-1 trauma center. 

Nurse educator for several years from undergraduate through the doctoral level including clinical rotations.

Column writer for Nursing Evidence-Based Practice column, having published dozens of articles on safe bedside nursing care. Peer reviewer for the Journal of Trauma Nursing.

Served as a nurse voting members of an Institutional Review Board (IRB) with current Collaborative Institutional Training (CITI) certification.

Professional nursing certifications in medical-surgical nursing, trauma nursing, neuroscience nursing and telemetry. 

View Dr. Bartzak's Consulting Profile.

Joseph B, Marzouk, MD, FACP, has been in clinical practice exclusively in the field of Infectious Disease since 1982 and has consulted and treated thousands of patients. He has more than 35 years of experience in the medico-legal aspects of Infectious Disease and has provided numerous objective reviews and testimonies for defense and plaintiff’s attorneys. 

Degrees / Licenses: MD (Licenses: AZ, CA), American Board of Internal Medicine, Infectious Diseases; Certification Board of Infection Control. HIV Specialist. See CV on Website for more details.

Areas of Expertise:  Infectious Disease in all medical specialties: 

• HIV/ AIDS
• Infection Control
• Food Poisoning
• Hepatitis

Dr. Mayer is an independent consultant and scholar that (for identification only) holds the position of Visiting Fellow in Human Flourishing,  Harvard University. He has been a full-time tenured professor with recent appoints in statistics, biostatistics, epidemiology, biomedical informatics, public health and medicine (psychiatry). He held various titles including, Professor (Part-time), Bloomberg School of Public Health and School of Medicine, Johns Hopkins University, Affiliated Professor, Mayo Clinic/ASU joint program in Biomedical Informatics, a member of the Research Staff at Mayo Clinic, and Professor at Arizona State University. 

Dr. Mayer continues to do research and mentor young physicians and medical students while doing a limited amount of consulting in epidemiology, biostatistics, statistics, observation studies and clinical trials. His consulting projects often focus on model development, execution and inferences. He is one of the few MD/PhD epidemiologists. He led a  group of 6000 physicians and epidemiologists that reviewed the science of COVID-19 

• Catastrophic Medical Case Management - Traumatic Brain Injury, Acquired Brain Injury, Spinal Cord Injury, Amputation, Soft Tissue Injury, Chronic Pain, Burns, Cerebral Palsy & Developmental Delay, Chronic Respiratory Conditions, Visual & Hearing Impaired
• Life Care Planning - Comprehensive Record Review and supportive documentation / Case Analysis, Case Summary Chronology, Clinical Interview and History with Patient, Medical-Legal Research, Assessment of Future Medical / Rehabilitation Needs
• Legal Nurse Consulting

A senior clinical faculty member at Harvard Medical School, Harold J. Bursztajn, M.D., is active in patient care in medical, psychiatric and judicial education nationally. He is qualified in both state and federal courts and is nationally recognized as a distinguished impartial, clinical, ethical and forensic expert to P/D attorneys and institutions. Individual and multispecialty team consultations available.

• Informed Consent & Malpractice
• Employment Litigation: ADA, Disability, Sexual Misconduct Discrimination, Worker's Compensation
• Emotional & Physical Damages: Conscious Pain & Suffering, Post Traumatic Stress Disorder (PTSD), Neuropsychiatry & Pain Imaging
• Standards For Experts
• Product Liability: Medical Devices & Pharmaceuticals, Toxic Tort
• Criminal Justice & Public Safety: Diminished Capacity, Drug Addiction, Competency to Confess, Death Penalty Mitigation, Workplace Safety
• Family & Custody Issues
• Testamentary & Contractual Capacity
• Professional & Organizational Ethics: Patient Care, Managed Care, Privacy
• Psychoanalysis & Cultural Perspectives

EXPERTISE IN: 1. The pathobiology, clinico-pathologic correlation, and histopathologic diagnosis of: diseases of the esophagus, stomach, small intestine, colon, rectum, anus, liver, and pancreas. 2. Human neoplasms (cancer) and preneoplastic conditions. 3. Establishing standard of care, causation and cause of death. 

BACKGROUND: 1. Anatomic Pathology Residency: Washington Univ-Barnes Hospital 1991-94. 2. Oncologic Pathology Fellowship: M.D. Anderson Cancer Center 1994-95. 3. Gastrointestinal and Liver Pathology Fellowship: Harvard-Brigham & Womens Hospital 1995-96. 4. Instructor at Harvard Medical School: 1996-1998. 5. Assistant Professor and Director of Gastrointestinal Pathology Division at Univ. of Texas Health Science Center-Hermann Hospital, Houston Medical Center: 08/1998 - 12/2000. 6. Staff GI Pathologist and Quality Assurance Director at Caris/Miraca Life Sciences, Dallas TX: 01/2001 - 04/2012. 7. Staff Pathologist, Anatomic Pathology Division of the North Shore-LIJ Health System, Long Island NY: 05/2013 - 05/2015. 8. Staff Pathologist, Anatomic Pathology Division of Alliance Health Sciences, Dallas TX: 01/2016 - present. 9. Sole Proprietor of Expert Pathology Consultation Services Laboratory since 01/2001.         

Dr. Torres was instrumental in creating a rather unique model of Gastrointestinal Pathology subspecialty-focused laboratory, that during his 12 yrs tenure became one of the largest private national Anatomic Pathology laboratories-Caris/Miraca Life Sciences.

Kenneth A. "Kenny" Stein, MD
Board Certified Emergency Medicine & Internal Medicine 
Subspecialty Certified in NeuroCritical Care 

Kenneth A. Stein, MD, ABPS, ABIM, UCNS, is Assistant Professor in the Department of Emergency Medicine, St. Louis University School of Medicine (a Level 1 Trauma Center). Dr. Stein has practiced Emergency Medicine and Critical/Intensive Care Medicine for 29 years. For 20 years, Dr. Stein was an Emergency Physician at St. Anthony's Medical Center of St. Louis, one of the busiest emergency departments in the State of Missouri. 

Dr. Stein has extensive experience in providing medical-legal expert services, having reviewed over 500 cases (both plaintiff and defense) and having given testimony over 200 times. Dr. Stein furnishes an unbiased opinion on medical malpractice/negligence cases. He also provides medical opinion concerning causation. Dr. Stein does not guarantee a favorable outcome but provides an honest assessment.

Dr. Stein has lectured nationally, and consults in the area of Pharmaceutical and Biomedical Product Development and Marketing.

Dr. Stein reviews cases (for both Plaintiff and Defense) of alleged Medical Malpractice / Negligence in areas including:

• Emergency Medicine        
• Critical Care Medicine / Intensive Care Medicine          
• Internal Medicine

Services provided include:

• Medical chart review and analysis   
• Providing opinion concerning the presence or absence of Negligence / Breach of the Standard of Care, Damages / Injury and Causation
• Survey of case for merit 
• Preparation of reports and / or affidavits        
• Preparation for opposing expert deposition and cross-examination        
• Medical literature search    
• Expert witness testimony at deposition and trial

Call 314-495-7009 for a complete CV, including presentations.

Elliot D. Felman, MD, is Board Certified in Family Practice. In practice for more than 32 years. Experienced in both plaintiff and defense review, deposition and testimony for evaluation of medical malpractice. Available for evaluation of Standard of Care for Family Practice, General Practice and Internal Medicine. Clinical Faculty - UCLA School of Medicine.  Expert Reviewer - State Medical Board of California.

Areas of Expertise:

Dr. Matthew Lee, MD, RPh, MS. is a Physician, Pharmacist, Pharmacologist and Toxicologist who also practices as an Expert Witness and Legal Strategy Consultant. Specific Benefits Include:

• Increased quality and integrity of written expert reports, based on an expanded knowledge base
• Time savings by only having to coordinate and discuss a case with one expert as opposed to two or more
• Since there is so much overlap between fields in the medical profession it is often hard to determine where one scope ends and another begins. This ambiguity is dramatically decreased , and scope increased by combining physician, pharmacist, and pharmacologist into one
• Communication skills of a pharmacist and experience dealing directly with the lay-public, in addition to the knowledge and background of a physician is extremely beneficial describing technical details to a jury
• Practicing in different realms within the healthcare field has allowed Dr. Lee to integrate the multiple facets giving him a unique and distinct perspective that no other expert has.

Case Experience Includes:

Kimberly M. Pearson, MHA, MBA, RN, CCHP is a Correctional Healthcare Consultant with over 37years of experience in the healthcare industry, including correctional healthcare (both medical and mental health), clinical nursing, management, and administration in a variety of healthcare venues. In her role as Deputy Agency Director for the Orange County Health Care Agency, Ms. Pearson was responsible for all medical and mental health care provided in the Orange County (California) adult and juvenile detention facilities. The adult jail system ranks in the "top ten" in the country in terms of size, with an average daily population of over 6,500 inmates. She has been honored as a National Award Recipient for Excellence in Executive Leadership at the 2016 Nurse.com Nursing Excellence GEM Awards (Giving Excellence Meaning). 

An expert in her field, Ms. Pearson delivers seminars and lectures on Correctional Healthcare topics around the country. In 2019, she  spoke on “The Art of Managing Regulatory Inspections,” to the National Commission on Correctional Healthcare in Fort Lauderdale, FL, on “Clinical Management for High-Risk Patients in this Litigious Environment,” to the American Correctional Health Services Association in San Jose, CA, and “Sticking Together: A Cohesive Correctional Healthcare Delivery System,” to the National Commission on Correctional Healthcare Leadership Institute in Las Vegas, NV. 

Litigation Support - Ms. Pearson previously provided Medical Malpractice and Wrongful Death case reviews as an in-house consultant for two law firms in the Midwest. She is currently the CEO/President of KP Consulting LLC, consulting on policy and procedure development and comprehensive correctional health system review and recommendations. Ms. Pearson has served as a correctional healthcare expert witness in over 100 cases in the past six years. Her services are available to attorneys representing plaintiffs or defendants and includes comprehensive written reports for both federal and state cases, standard of care evaluation, and correctional health care deviation identification.