Mobile Dysphagia Consultants


Joan E. Baumer, MD, FAAFP

The President and Chief Medical Officer of MassTex Imaging, LLC. She has 32 years of experience in medicine, as she graduated in 1978 from Davis University in California and has completed both residency and fellowship in Family Medicine. Her career has expanded to not only direct patient care, but chairing departments, supervising other physicians, and developing programs to better serve her patients. She a family medicine physician and has developed the skills and knowledge to work alongside the speech language pathologist to improve patient care around dysphagia management. Dr. Baumer is one of the founding members of MassTex Imaging, LLC and is also a member and president of DiagnosTEX and Professional Imaging, LLC in Texas. Separate from Dr. Baumer’s duties as president and direct patient care, she runs and chairs the Family Medicine Department at John Peter Smith Hospital in Texas. Dr. Baumer truly understands the necessity of not only providing a Modified Barium Swallow Study to determine safe swallow strategies, but the importance of looking at the whole patient separate from the MBSS. This is why MassTex Imaging is more than just a MBSS mobile practice, but a medical practice that focuses on Dysphagia consultation including MBSS, and provides both initial consultations to patients as well as continuity of care.

Stephen Brand, MD, PhD

Dr. Brand graduated in Medicine from University of Western Australia and also holds a PhD in Physiology. Subsequently, he was a research fellow at the University of Copenhagen Denmark and Fellow in Endocrinology & Gastroenterology at the Massachusetts General Hospital, Harvard Medical School. For ten years, Dr Brand was on the faculty in the Gastrointestinal Unit, Massachusetts General Hospital achieving the rank of Clinical Associate in Medicine and Associate Professor of Medicine at Harvard Medical School. He was an internationally recognized leader in gastroenterology research and was elected to American Society for Clinical Investigation. He has published over 75 papers in leading journals. He then pursued a successful career in the Bio Pharmaceutical Industry as a research director at Proscript, Tanabe Research Laboratory, and Waratah Pharmaceuticals leading the discovery and development of novel drugs, for the treatment of cancer, inflammatory diseases and diabetes, which are now in the clinic. Since 2006, Dr Brand has specialized as physician in diagnostic radiology to diagnose disorders of swallowing and esophageal function.

Clement J. Grassi, MD, FSIR

Dr. Grassi joined MassTex Imaging in December 2013. Dr. Grassi is a Board Certified Radiologist with a BA in Biology from Harvard College and an MD from Tufts University School of Medicine. He completed his radiology residency at Beth Israel/Deaconess Hospital. Dr. Grassi has performed numerous Videofluoroscopic studies during his career and continues as a staff Radiologist at NE Baptist Hospital.

Olena Marta Saikewicz, MD

Dr. Saikewicz joined MassTex Imaging in June 2014. Dr. Saikewicz graduated from State University at New York at Buffalo and completed her residency in Radiology at BU Medical Center. She brings years of experience performing Videofluoroscopic Studies in various NE hospitals. Dr. Saikewicz is certified by the American Board of Radiology.

Michael Stevens, MD

Dr. Stevens joined MassTex Imaging in June 2012. He is a graduate of Tufts University School of Medicine and the Tufts/New England Medical Center Family Medicine Residency, where he served as Academic Chief Resident. Following five years of private practice primary care, Dr. Stevens shifted his clinical focus to swallowing mechanics/disorders and dysphagia pathophysiology. He has four years experience in MBSS, dysphagia consultation and dysphagia management with a focus on the geriatric population. Dr. Stevens has held teaching positions at Tufts University School of Medicine and Boston University School of Medicine, and has served as Medical Director for a company that specialized in diagnostic testing for swallowing disorders.

Beverly Timerding, MD

Dr. Timerding joined Masstex Imaging in December 2018.  She graduated from University of Cincinnati College of Medicine and completed her residency in Emergency Medicine at Allegheny General Hospital in Pittsburgh, Pennsylvania in 1986 along with board certification.  She subsequently entered an emergency medicine research fellowship in Cincinnati completing multiple studies concerning the treatment of the complications of severe hypovolemic shock and early studies of anti-thrombolytics in the treatment of stroke.  She received the Smith, Kline and French/Emergency Medicine Foundation Fellowship Award.

After practicing academic and clinical emergency medicine at Wake Forest University in Winston-Salem, NC until 2001, she entered a busy emergency medicine practice in Omaha, Nebraska.  In 2012 to be nearer to family, she moved to Massachusetts and has continued working with emergency department patients at some of the most critical times in their lives.

She received video-fluoroscopic training at MTI and incorporates her experience of working with people affected by stroke and neurologic disabilities.

Genevieve von Walstrom, MD

Dr. von Walstrom began a career in research as an undergraduate at the University of Vermont. Her work focused on the use of multiple displacement amplification (MDA) in the investigation of human papilloma virus (HPV) physical status and continued in cancer based research studying the CDKN2A tumor suppressor gene in the development of Familial Melanoma. Both studies were published in the Journal of Clinical Pathology and the journal of Human Mutation in 2007 and 2011, respectively. 

Before matriculating into medical school Dr. von Walstrom co-published another paper with the Department of Radiation Oncology at Downstate Medical University studying a predictive assay suitable for tumor surgical isolates using hybrid spheroids in suspension. Her work was published in the prestigious peer reviewed journal Acta Oncologica, the official journal of the five Nordic oncological societies. 

After graduating from medical school with honors, Dr. von Walstrom began training in Obstetrics and Gynecology at New York Methodist Hospital – A Weill Cornell affiliate.  Dr. von Walstrom received awards for her exceptional patient care and professionalism as a resident physician, but she is most proud of the work she did with patients suffering from gynecologic malignancies. Working with clinical teams of gynecologic oncologists at three neighboring academic institutions, Dr. von Walstrom investigated the utility of the ChemoFx® assay in predicting patient response to chemotherapy, making individualized, tumor specific cancer treatment possible.  Dr. von Walstrom presented her research at multiple medical society meetings and research symposiums across the country; her work was published in the Journal of Clinical Oncology in 2013.

Dr. von Walstrom is also an avid writer and published poet.  Her most recent interests focus on exploring the art of listening, storytelling, and the Spoken Word.

Frank J. Vittimberga, M.D., F.A.C.S

Dr. Frank Vittimberga is a licensed physician and a Harvard College graduate. Following graduation, he graduated from Tufts University Medical School where he was elected Class President. He completed his internship and residency in General Surgery at the Boston City Hospital. His vascular surgery fellowship training was completed at Baylor University, Houston Texas under the tutelage of the highly esteemed surgical pioneers, Drs. Michael De Bakey and Denton Cooley.  He also served 2 years the United States Air Force based in Texas where he performed over 600 general and vascular surgeries during the Viet Nam war.

Returning to Boston, he joined Dr. Isaac Mehrez at the Mount Auburn Hospital in Cambridge, MA where he developed the vascular surgery program teaching hundreds of medical interns, students and surgical residents.  A gifted teacher, he holds the position of Clinical Professor of Surgery at Harvard Medical School.  A recipient of many professional awards including Boston Magazine’s prestigious Top Doc Heroes 2013 Award for saving the life of Officer Richard Donahue, who was critically injured during a shootout with the Boston Marathon bombing suspects. Dr. Vittimberga is double board certified in general and vascular surgery.

Speech Language Pathologists

Joan Kelly Arsenault, MA, CCC-SLP BCS-S

Joan is the CEO and Managing Owner of MassTex Imaging, LLC. She is a Speech Language Pathologist with over 30 years of experience in dysphagia management with infants, children and adults including MBSS and FEES. Joan is one of 25 Speech Language Pathologists who is Board Certified Specialist in Swallowing and Swallowing Disorders in NE States. She has spoken and presented both nationally and at the state level in the areas of pediatric and adult dysphagia including head and neck cancer, neurological disorders, and infant feeding disorders. Joan has developed adult and pediatric dysphagia programs in acute care hospitals, rehabilitation hospitals, and outpatient settings. She has worked on interdisciplinary pediatric feeding teams, worked closely with ENT and prosthodontists for improved swallowing outcomes for head and neck cancer, and collaborated directly with numerous radiologists and GI physicians to implement and develop MBSS programs. She has worked in a variety of settings including acute care, skilled nursing facilities, home care, and outpatient clinics. Joan has taught dysphagia courses at the graduate level and is an adjunct professor to several Boston area graduate programs. She is licensed to practice in Massachusetts, Connecticut, Maine, New Hampshire and Rhode Island.

Katy Anderson, MS, CCC-SLP BCS-S

Katy Anderson is a Speech Language Pathologist, Board Certified in Swallowing and Swallowing Disorders. She received her master’s degree from the University of Washington, Seattle. She has experience working in a variety of settings including skilled nursing facilities, acute care hospitals, and outpatient services. Katy has worked with adult and geriatric patients with complex medical issues including tracheotomy and ventilator dependency, focusing on swallowing disorders, cognitive communication impairments, speech and language disorders, as well as alternative augmentative communication. Katy is currently licensed in Massachusetts, New Hampshire, Maine, Connecticut and Rhode Island.

Robyn Earley, MA, CCC-SLP

Robyn Earley is a Speech-Language Pathologist who received her BA in Speech-Language Pathology from University of Florida and her masters degree in Communication Sciences and Disorders from San Diego State University. She has over 20 years experience working with adults with a focus on degenerative neurological disorders in a variety of settings including LTACH, subacute rehab, outpatient, home health and long-term care. Robyn served as the founder and head of a large Speech-Language Pathology and Audiology team at a Harvard Medical School affiliated health care continuum. As part of that experience, she established, directed and served as the clinical specialist for the Videoflouroscopy program. Robyn is also Lee Silverman Voice Therapy Technique certified. In addition to her speech pathology experience, Robyn is a certified LEAN/Six-Sigma green belt. She also has extensive bioethics experience with a focus on feeding and swallowing disorders and end of life. Robyn is licensed to practice in MA, RI and CT. Robyn is excited to combine her passion for clinical work, experience in healthcare administration and background in bioethics to serve as Regional Director for MassTex Imaging in RI and CT.

Elizabeth Harrison, MS, CCC-SLP

Elizabeth is a licensed speech language pathologist in Massachusetts, Rhode Island, Maine and New Hampshire. She has experience in the long term care setting working primarily with adults with dementia, stroke, and psychiatric disorders, targeting swallowing, cognition and/or language, as well as experience in acute care hospitals. She is currently certified in Vital Stim and has completed over 3,800 MBSS.

Amy Litwack, MS, CCC SLP/BCS-S

Amy is a Speech‐Language Pathologist with over 20 years of clinical experience in adult neurogenics, and is a Board Certified Specialist in Swallowing and Swallowing Disorders. She has been with MassTex for over 8 years, and has also worked in acute medical and rehab hospitals, completing over 7,000 MBSs. In addition to her clinical work, she is an instructor and clinical supervisor at a local Boston graduate program in speech pathology.

Amy Parker, MS, CCC-SLP

Amy graduated from Boston University with a degree in Speech Pathology and has over 19 years of experience as a Speech Pathologist treating and diagnosing adult neurogenics including dysphagia. She joined MassTex Imaging in May of 2013. Amy brings with her a wealth of experience having performed MBSS in a Mobile and Hospital environment.

Jennifer Picone, MS, CCC-SLP

Jennifer is a Speech Language Pathologist with over 15 years of experience in acute care, short term rehabilitation, long term care, outpatient, home health, and early intervention settings. She joins the MassTex team with over 12 years of mobile radiographic swallowing assessment experience; servicing a wide range of adult and pediatric patients. She has performed well over 15,000 studies throughout her career.

Rebecca Scheel, MS, CCC-SLP-BCS

Rebecca Scheel, MS CCC-SLP-BCS is a board certified Speech Language Pathologist with over 20 years experience working in the area of dysphagia and performing videofluoroscopic swallow studies (MBSS) and endoscopic swallow evaluations (FEES).   She received her Master’s degree from Boston University in Speech Language Pathology Communication Sciences.  She has treated patients of all ages, within acute care, acute rehabilitation hospitals, outpatient clinics, home health and skilled nursing facilities with a wide range of medical diagnoses.  She provides and lectures for FEES foundation courses across the country.  She co-teaches Advanced dysphagia and guest lectures for Boston University Sargent College.  In addition she has a strong interest in clinical research and has published in the area of post extubation dysphagia.

Brittany Thompson, MS, CCC-SLP

Brittany is a Speech Language Pathologist who received her degree from Northern Arizona University. She has experience working in various settings including hospitals, outpatient clinics, in-home therapy, schools, and skilled nursing facilities. She has worked with infant, children, adult, and geriatric patients focusing on language, cognition, articulation, fluency, augmentative communication, voice, and swallowing disorders. She is trained to provide Myofacial Release for Dysphagia Management. She is currently licensed in New York and Massachusetts.

Lauren White, MS, CCC-SLP

Lauren received her master’s degree in Speech-Language Pathology from the Massachusetts General Hospital Institute of Health Professions. She has experience working in a variety of settings including acute care, sub-acute care, outpatient, home health, short term rehab, and long term care. Lauren specializes in the diagnosis and treatment of dysphagia, aphasia, and cognitive-linguistic impairments in the adult and geriatric population. She is certified in vital stim as well as the MBS IMP. Lauren is currently licensed in MA and RI.


Our medical team is dedicated to treating each and every patient with dignity, compassion and respect. The experience is designed to be comprehensive, convenient and worry free.