Usama Yassi, MD

Dr. Yassi joined Pathology Laboratory Associates (PLA) in August 2023. He is board certified in Anatomic and Clinical Pathology, and Dermatopathology and brings impressive experience in Surgical Pathology and Dermatopathology to PLA. Dr. Yassi earned his medical degree in Baghdad, Iraq in 2004 and emigrated to the United States as a refugee in 2008. In 2013, he started his Anatomic and Clinical Pathology residency at University of South Dakota in Sioux Falls, South Dakota and graduated in 2017....
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Jason Stratton, MD

Dr. Stratton joined Pathology Laboratory Associates (PLA) in July of 2012. He earned his undergraduate education in Biochemistry and Comparative Religion at the University of Washington. In 2007, he received his medical degree from Joan C. Edwards School of Medicine at Marshall University in Huntington, West Virginia. Dr. Stratton completed his residency training in Anatomic and Clinical Pathology at the Cleveland Clinic. In 2011, he continued his training at the Cleveland Clinic, receiving sub-...
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Igor Shendrik, MD

Dr. Shendrik joined Pathology Laboratory Associates, Inc. in August of 2004. He served as Assistant Professor and Director of the Dermatopathology Section at Creighton University Medical Center. Dr. Shendrik graduated with an MD degree with honors from the Kharkov Medical Institute in Kharkov, Ukraine, followed by postdoctoral training in Pediatrics, and a residency program in Anatomic and Clinical Pathology at Columbia University College of Physicians and Surgeons in New York. He completed a Fe...
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Erica Kumar, MD

Dr. Kumar joined Pathology Laboratory Associates (PLA) in September 2015. She received her Bachelor of Arts with a major in Art History and Minor in Chemistry prior to completing her medical degree at the University of South Alabama in Mobile. She then completed pathology residency at the University of Texas Health Science Center at Houston, during which time she rotated at several hospitals within the Houston Medical Center, including MD Anderson Cancer Center and Memorial Hermann Hospital. Her...
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Paul Gillum, MD

Dr. Gillum and the Oklahoma Dermatopathology Institute merged with Pathology Laboratory Associates (PLA) in August of 2017. Dr. Gillum completed his Bachelor of Science with distinction in Microbiology, his Doctoral Degree with outstanding distinction, and his Dermatology residency at the University of Oklahoma. He took his Dermatopathology fellowship at the University of Colorado under the guidance of Loren Golitz, subsequently returning to his faculty position at the University of Oklahoma in...
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Lisa (Mask) Bull, MD

Lisa (Mask) Bull, M.D., is board certified in Dermatology and Dermatopathology. She earned a Bachelor of Science degree in Biochemistry at the University of Tulsa in 2009 and earned a medical degree at the University of Oklahoma College of Medicine in 2013.  In 2014 she completed an internship at the University of Oklahoma in Tulsa and finished a residency in Dermatology at Texas Tech Health Sciences Center in 2017. She completed a fellowship in Dermatopathology at the Tulane University School...
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A. Neil Crowson, MD

Dr. Crowson has been President of Pathology Laboratory Associates since 2008 and is formerly Chief of Medical Staff at St. John Medical Center in Tulsa, OK.  Dr. Crowson joined PLA in March of 1999, coming from Winnipeg, Canada where he spent fourteen years directing the laboratory department at the Misericordia General Hospital and Central Medical Laboratories which performed both Anatomic Pathology and Clinical Pathology. He did his pre-med at Queen’s University in Kingston, Ontario and att...
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