Drs Petros Efthimiou and Olga Petryna will provide timely and accurate review of all medical records. With decades of experience, they are prepared to opine on a certificate of merit and provide expert testimony. A Rheumatology Expert Witness must be credible and able to generate confidence. Opinions should be concise, authoritative and clear. The role as an expert depends upon superb communicative skills. Drs Efthimiou and Petryna with five decades of combined clinical experience and an extensive publication record, have been invaluable in substantiating their expertise in high profile cases.  Dr Efthimiou has been admitted as an expert at the National Vaccine Injury Compensation Program in Washington, DC.