Medical - Medicine Expert Witnesses

David Martinez has over 35 years of experience in the field of Medical Billing. His expertise covers all facets of the revenue cycle, and he possesses a comprehensive understanding of relevant laws, regulations, and statutes, especially those applicable in California. 

Accurate Medical Billing are among the most sought-after expert witnesses. Accurate the only billing service to earn Preferred Partner status with the San Bernardino County Medical Society and the only billing service authorized in California to perform CEUs for doctors. They possess extensive knowledge and experience in insurance billing, claims, and collections. Accurate is the recommended billing service by and for CCA members and endorsed and recommended by ICAC. Co-Chair of the Insurance and Managed Care Committee – California Chiropractic Association. 

 Mr. Martinez is the administrator of the largest medical billing group on Facebook, which boasts over 6,000 members. This role entails significant responsibility and trust. He has curated a highly qualified team of experts in the field, which includes Certified Coders, Auditors, and Medical Reimbursement Specialists. His team comprises former claims examiners for insurance companies, as well as auditors, billers, coders, and compliance specialists, giving them deep insights into insurance companies' strategies.

Areas of Expertise:

Partial Background Experience:

• Consolidated Healthcare Services - Director of Billing and Collections for 54 current and past, state-of-the-art Open MRI, primarily in the Southeast United States. Mentored training developed a direct staff of 24 and an indirect staff of 72.
• Prime Healthcare Hospital - Business Office Manager Incorporated fully managed care training and collections. Collaborated with legal counsel in the interpretation of medical records.

 Education / Training:

• Certified Professional Coder
• Certified CE Educator (California Board of Chiropractic Examiners)
• Certified Medical Reimbursement Billing Specialist
• Certified Claims Auditor
• Certified Claims Examiner
• Certified HIPAA Professional
• Certified Medical Claims Biller
• Certified Compliance Officer (9 others) Certifications)

Dr. Andrew Mark Rodgers, BS, MS, DC, is a National Certifed Chiropractic Expert Witness with over 38 years of experience. He has worked on over 120 malpractice cases on the proper standard of care and has testified in 30 cases in the last 22 years. Dr. Rodgers is available for complimentary verbal evaluations, offers expedient affidavits and cost-effective testimonies and depositions for chiropractic deviation from standard of care cases nationwide. He represents both Defendant and Plaintiff.

Areas of Expertise

• Malpractice cases – proving standard of care and deviationsm, causation, and informed consent issues
• Administrative law, state laws, and honest medical protocols and billing procedures
• Plaintiff/defendant expert witness testimony in trauma cases, motor vehicle cases, workers comp cases and/or slip and fall injuries
• Insurance fraud
• Continues very active clinical practice

Paul M. Adler, DO, FACEP, MBA, Medical Director for the Ventura County, California, Department of Corrections, has worked in Correctional / Jail / Prison Medicine & COVID-19 Preparation & Response. He has overseen the care of inmates in Jails in California and New York, as well as Prison inmates who have been transferred to county facilities to serve their terms for years in county jails in California. He has also overseen Correctional health car in locked units in Hospitals . 

Dr. Adler is the President-Elect of The American Correctional Health Services Association of California / Nevada, which represents all clinicians and administrators in Jails/Prisons in California and Nevada. He previously oversaw a County Hospital, County Nursing Home and ran a County Health Department and oversaw Correctional healthcare for the Westchester, New York Jail.

Litigation Support - Dr. Adler has defended Jails and Prisons in Southern California, Idaho, Texas, North Carolina, New York, Pennsylvania, etc. He is currently the expert consultant to the California Prison System for Covid litigation and the medical consultant to the judicial consent decree overseeing care in the Philadelphia Department of Prisons. He also served as the expert consultant to the ACLU for Covid in the Illinois Department of Corrections

Dr. Adler still works as a full-time practicing physician and has helped attorneys and insurance companies in Emergency Medicine, Nursing Home Medicine, Public Health and Hospital Administration since 1985. He has been involved in Plaintiff litigation in many states including against Rikers Island, NY and Cook County Jail and is available to review and consult on clinical Correctional/Jail/Prison cases for attorneys for both Plaintiff and Defense.

Services:

• COVID-19 Preparation & Response
• Medical Oversight of Federal Consent Decrees
• Screen Cases for Merit
• Review, Analyze and interpret Medical Records
• Provide Basic or Comprehensive Written Reports
• Interpret Standards of Care, Deviation and Adherences as they Relate to Correctional Health Care
• Develop Chronological Time Lines
• Policy and Procedure Development

Monica M. Argumedo, MD, is a Board-Certified Forensic and Clinical Psychiatrist (ABPN). Dr. Argumedo has testified about her forensic opinions in more than 40 cases in open court. In psychiatric practice for more than 15 years, Dr. Argumedo teaches at Rush University Medical School/Rush University Medical Center as Assistant Professor in Psychiatry. She teaches psychiatry residents in topics related to psychiatry and the law, and psychiatry in medicine. She also interviews prospective medical students through her role on the Medical Admissions Committee.

Dr. Argumedo works with Employers in cases where mental health/psychiatric concerns about an employee require an objective and unbiased Fitness for Duty Evaluation and report. She also consults in employment matters and litigation and serves as a disclosed expert witness. Her work addresses fitness for duty (FFD) in a litigated environment, Wrongful Termination, and Psychiatric Disability. Additional experience includes FFD of peace officers and first responders.

Services - Forensic Psychiatry, Medico-Legal evaluations, medical complications, review of records, written reports, deposition testimony, trial testimony, consultation to attorneys addressing psychiatric issues relevant in a case, opposing counsel expert reports or expert qualifications, assisting with cross-examination questions, and lines of inquiry.

Areas of Expertise:

Gerald W. Smetana, MD, Board Certified in Internal Medicine, is a General Internist with 38 years of experience in an academic primary care practice at Beth Israel Deaconess Medical Center in Boston. He is also a Professor of Medicine at Harvard Medical School where he has taught internal medicine to medical house staff and also teaches extensively to practicing clinicians in continuing medical education settings. Dr. Smetana is a Master of the American College of Physicians.

Practicing in an outpatient setting, Dr. Smetana cared for a panel of patients that was weighted towards those with multiple chronic illnesses and high disease complexity. In addition to all aspects of office based general internal medicine, his areas of interest include Preoperative Medical Evaluation, Hypertension, and Headache.

Dr. Smetana has been repeatedly selected as a Best Doctor in a national survey. He publishes in the peer reviewed medical literature and medical texts, has edited textbooks, and has helped to develop national guidelines on topics in internal medicine. He has been invited to deliver seminars and presentations on various topics within his area of expertise nationally and internationally. He has been a section editor for the Annals of Internal Medicine. In April 2025, Dr. Smetana retired from clinical practice, but remains active in scholarly work, lecturing, and consulting.

Litigation Support - Dr. Smetana reviews cases for both plaintiffs and defendants and has testified at deposition and at trial as an expert on numerous occasions in most states in the eastern United States. He has reviewed medical malpractice cases over the past 20 years both for plaintiffs and doctors. Dr. Smetana also consults for risk management insurers. His record review and medicolegal consultation services are available throughout the United States.

William Bisordi, MD, FACP, is a Board Certified Internist and Gastroenterologist with 35 years of experience in private practice. Dr. Bisordi currently serves as a consultant in field of medical record review, lab analysis, and outcomes and adverse reactions for the Pharmaceutical and Healthcare industry.

Career Experience:

• New York State Department of Health Office of Professional Medical Conduct, Hearing Board, 2003-2019
• Board of Directors, Secretary, Westchester Health Care Corporation, 1998-2003
• Medical Director, Care Plus Health Plan, 1995-1997
• Senior Physician Consultant, Island Peer Review Organization, 1992-1998

Litigation Support - Dr. Bisordi has extensive experience in record review for both plaintiff and defense attorneys over the past 35 years. His expertise includes Medical Record Review, Negligence Issues, Standard of Care Issues, Medical Damages, and Medical Data Analysis. In his capacity as a Medical Expert, he helped win a $20,000,000 verdict.

Areas of Expertise:

  Fee Schedule upon Request.

Douglas W. Bowerman, MD, FACP, SFHM, FABQAURP, FAIHQ is certified by the American Board of Internal Medicine. In his capacity as a Hospitalist, he provides full-time clinical care to hospitalized patients. Certifications and Associations - Dr. Bowerman is also Certified in Health Care Quality & Management and Fundamentals of Critical Care. He is a Fellow of the American College of Physicians, a Fellow of American Institute of Healthcare Quality, and a Senior Fellow of Hospital Medicine. Litigation Support - In addition to providing care for hospitalized patients, Dr. Bowerman operates a private consulting business that evaluates potential Medical Malpractice cases involving the clinical care provided by Hospitalists. Based on assessment of the case, he advises counsel on its merits, and when needed, writes formal reports, gives deposition testimony, and provides expert testimony in court. Dr. Bowerman supports both plaintiff and defense cases. In the twenty years he has offered litigation support services, he has reviewed over 900 cases, given 40+ depositions, and testified in court 10+ times. Areas of Expertise:

Presentations and Publications - Dr. Bowerman has authored several publications and delivered numerous presentations on such topics as Assigning Duty to Hospitalists, Eradicating Errors and Restoring Credibility, the Determination of Brain Death, and Hospitalists as Respected Attending Physicians.

Dr. Lorne Sheldon Label, MD, MBA, FAAN, is a Board Certified Neurologist who has extensive training in the treatment of all neurological diseases of adults and children. The field deals with brain, spinal cord, nerve and muscle disorders. Dr. Label has been recognized by the court as having the education, experience, training, and knowledge to assist in rendering an opinion on the subject of Adult and Pediatric Neurology and Acupuncture. His ability is in explaining complicated methods and procedures, technical medical matters and data, as well as interpreting and rendering opinions about a certain set of facts to the court.

Dr. Label has offered his Expert Witness testimony to the legal industry for over 35 years. He has been retained as an Expert by attorneys for both Plaintiff and Defense over 200 times. His services are available for Medical Record Review and Testimony, Medical Malpractice Cases, and Insurance Questions Regarding Neurological Issues.CV available on website or by email.

Areas of Expertise:

Dr. Keith Chamberlin is an award-winning Anesthesiologist in active clinical practice. Georgetown educated, he is a former Dartmouth Faculty member and current Fellow of the American Society of Anesthesiologists. He is a former Hospital Chief of Staff and Decorated United States Army veteran.

Litigation Support - Dr. Chamberlin is available to serve as an expert witness on cases involving anesthesiology standard of care and causation.  He also has significant medical management experience, having served as the CEO of multiple medical groups and an accountable care organization (ACO). As such, he is also available to serve as an expert witness on cases involving physician credentialling, provider agreements, physician employment contracts, healthcare billing and fraud, safety, quality, etc.

Dr. Chamberlin offers expert witness services to attorneys representing plaintiff and defense. He is an experienced expert witness at both deposition and trial. His services include medical record review, thorough reporting, deposition, and testimony as needed.

Areas of Expertise:

Ernest N. Charlesworth, MD, is a Diplomate of the American Board of Dermatology, the American Board of Internal Medicine, American Board of Allergy & Immunology, and the American Board of Diagnostic Laboratory Immunology. He has over 40 years of experience in his field of expertise.

Dr. Charlesworth is one of only a few United States physicians who is board certified in both Allergy / Immunology and Dermatology. Well-versed in his area of expertise, he has published over 50 peer-reviewed articles, several textbook chapters, and two textbooks. He has been honored by the American College of Allergy, Asthma, and Immunology for both Distinguished Service and as a Distinguished Fellow.

Dr. Charlesworth offers litigation support, except independent medical examinations, to attorneys representing both Plaintiff and Defense. He has been deposed and/or testified approximately 15 times since 2010. His services include issues of causation and standard of care. Dr. Charlesworth has completed the National Catholic Certification Program in Health Care Ethics. He retired from active medical practice in May of 2014 but continues to be active in academic medicine.

Areas of Expertise:

Jessica Chaudhary, MD, is a Board Certified, Harvard and Yale trained Psychiatrist with specialties in Psychotherapy and Psychopharmacology. Dr. Chaudhary is a clinical instructor at Yale, and a fellow of the American Psychiatric Association. She has over 10 years of experience focusing on her fields of expertise.

Dr. Chaudhary treats conditions such as anxiety disorders, depressive disorders, attention deficit disorders, women's mental health issues, substance use disorders, psychosis, and dementia with behavioral disturbance.  She has expertise in caring for those with complex medical and co-morbid psychiatric conditions, and she treats individuals across the life span. 

Dr. Chaudhary can provide all services through TELEHEALTH.

Litigation Support - Dr. Chaudhary offers litigation support services in civil and criminal cases to attorneys for Plaintiff and Defense. She is a private consultant and expert witness for attorneys and organizations nationwide. Her services include:

• General Psychiatric Issues
• Women's OB / GYN Issues
• Substance Abuse Issues
• Evaluation and Treatment of Impaired Professionals (and/or consultation with their professional organizations)
• Independent Medical Examination
• Disability Evaluation

Education: Wellesley College, BA; University of Washington School of Medicine, MD; Yale University, Internship and Residency in Psychiatry; Harvard University, Fellowship in Psychosomatic Medicine

Medical Licenses: CT, MA, FL, TX

View Dr. Jessica Chaudhary's Consulting Profile.

Lawrence Amsel, MD, MPH, specializes in Forensic Psychiatry, including personal injury and psychiatric malpractice. With an MD from Yale University and an MPH in Biostatistics from Columbia University, Dr. Amsel combines his academic credentials, including multileg publications, and clinical expertise including decades as an inpatient and emergency room psychiatrist. With this experience he serves as an expert witness to offer excellent evaluations, written reports and court testimony. 

Dr. Amsel provides Litigation Support services to attorneys representing Plaintiff and Defense. His services include serving as expert witness in psychiatric aspects of personal injury, psychiatric malpractice,  medical record review for causation and standard of care. He has expertise in trauma, PTSD, suicide, Prolonged Grief Disorder, competency issues and medical decision making. He was one of the early champions of the application of Decision Science, Game Theory, and Behavioral Economics to Psychiatric Research.

Areas of Expertise:

Background - Dr. Amsel serves as an expert witness in matters related to psychiatry, with a focus on  Malpractice, Post Traumatic Stress Disorder (PTSD), Suicide, Grief, Medical Decision Making, Hospital Psychiatric Care, and appropriate Evidence-based Standards of Care. Excellent references from multiple law firms are available on request. 

Dr. Amsel's expertise in dealing with the interface of legal and psychiatric issues is based on 28 years of experience in clinical practice, academic psychiatry, research, and public health, as well as his experience as an expert witness.

As an expert on the effects of traumatic experiences, especially after 9/11, Dr. Amsel co-directed the Trauma Studies and Services Division at the New York State Psychiatric Institute. He has been extensively involved in treating victims of 9/11 and their families, in doing research on the effects of the 9/11 attacks on the survivors and First Responders, and in training clinicians in cutting edge treatments for PTSD and Complicated /Traumatic Grief. This has given him a strong foundation as an expert on PTSD and other psychological effects of various types of trauma. It has also made him an expert on malpractice cases in this area. 

Dr. Amsel studied mathematics at Columbia University before entering Yale University School of Medicine. After completing residency training he joined the Columbia faculty completing two prestigious National Institute of Mental Health research fellowships and obtained an Masters in Public Health (MPH) specializing in mental health statistics, and Child Psychiatry Research. 

View Dr. Amsel's Consulting Profile.