HCWP Staff
Hematology
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Craig Seaman, M.D.
Physician Clinical Director, Adult Services
Specialty: Hematologist
Dr. Seaman is an adult hematologist and the Clinical Director of the Hemophilia Center of Western PA.
Read MoreDr. Seaman is an adult hematologist and the Clinical Director of the Hemophilia Center of Western PA. He specializes in disorders of hemostasis (bleeding) and thrombosis (clotting) and is active in research, studying aging and aging-related disorders in patients with hemophilia and von Willebrand disease. Dr. Seaman received his medical degree from Marshall University School of Medicine and completed his internal medicine residency and hematology/oncology fellowship at UPMC. He is an Assistant Professor of Medicine at the University of Pittsburgh.
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Frederico Xavier, M.D, M.S.
Physician Clinical Director, Pediatric Services
Specialty: Hematologist
Dr. Xavier joined the Hemophilia Center of Western PA in July 2017, as Associate Clinical Director, and with a joint appointment as an Assistant Professor at the University of Pittsburgh and faculty in the Division of Pediatric Hematology/Oncology at UPMC Children’s Hospital of Pittsburgh.
Read MoreDr. Xavier joined the Hemophilia Center of Western PA in July 2017, as Associate Clinical Director, and with a joint appointment as an Assistant Professor at the University of Pittsburgh and faculty in the Division of Pediatric Hematology/Oncology at UPMC Children’s Hospital of Pittsburgh. Dr. Xavier completed medical school, a pediatric residency, and fellowship training in Brazil. He then completed a second pediatric residency in New York, a pediatric hematology/oncology fellowship at St. Jude Children’s Hospital, Memphis, TN, and a pediatric hemostasis fellowship at the Hospital for Sick Children, Toronto, Ontario, Canada in 2011. Following this, he completed a master’s degree in clinical research at the Indiana University-Purdue University Indianapolis in 2014.
Dr. Xavier has published peer-reviewed articles and book chapters in the field of pediatric hemostasis; and is currently awarded with a research grant to study inflammation in Hemophilia.
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Nicoletta “Niki” Machin, DO, MS
Physician
Specialty: Hematologist
Dr. Niki Machin is a Pittsburgh native and adult hematologist who loves caring for people with bleeding disorders, with a special focus on women’s health and pregnancy.
Read MoreDr. Niki Machin is a Pittsburgh native and adult hematologist who loves caring for people with bleeding disorders, with a special focus on women’s health and pregnancy. She enjoys helping patients navigate heavy menstrual bleeding, family planning, and the unique changes that come with pregnancy and postpartum life.
Dr. Machin believes in listening closely, partnering with patients to understand their goals, and building care plans that support both health and quality of life. She is passionate about improving care for people with von Willebrand disease, hemophilia, and rare bleeding conditions, and is active in research aimed at expanding treatment options—especially for women and pregnant patients, who have historically been under-recognized in this field.
When she’s not in clinic, Dr. Machin enjoys spending time with her family, teaching trainees, and working with national collaborators to improve care for all people with bleeding disorders. -
Busola Oluwole, M.D.
Physician
Specialty: Hematologist
Dr. Oluwole is an adult hematologist with a focus on hemoglobinopathies and inherited thrombophilia (clotting disorders).
Read MoreDr. Oluwole is an adult hematologist with a focus on hemoglobinopathies and inherited thrombophilia (clotting disorders). She earned her medical degree and a Master of Science in Clinical Research from the University of Pittsburgh. She then completed her Internal Medicine residency at UPMC, where she was part of the Global Health Track. Following her residency, she pursued fellowship training at the University of Washington/Fred Hutchinson Cancer Center in Seattle. After completing her training, Dr. Oluwole returned to Pittsburgh to begin her academic career as an Assistant Professor of Medicine at UPMC. AT HCWP, she leads an inherited thrombophilia clinic. Her research interests are in sickle cell disease, women's health, and thrombophilia.
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Deirdre Nolfi-Donegan, M.D.
Physician
Specialty: Hematologist
Deirdre Nolfi, MD, is a pediatric hematologist/oncologist and is certified in general pediatrics and pediatric hematology/oncology by the American Board of Pediatrics.
Read MoreDeirdre Nolfi, MD, is a pediatric hematologist/oncologist and is certified in general pediatrics and pediatric hematology/oncology by the American Board of Pediatrics. She is assistant professor of medicine at the University of Pittsburgh School of Medicine. She received her medical degree from Rutgers Robert Wood Johnson Medical School and completed her residency at Cohen Children’s Medical Center, followed by her fellowship at UPMC Children’s Hospital of Pittsburgh. Dr. Nolfi’s clinical interests include hemostasis, thrombosis, and platelet function disorders. She is a member of the American Society of Hematology, the American Society of Pediatric Hematology/Oncology, and the Hemostasis and Thrombosis Research Society.
Advanced Practice Provider
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Ashley Werle, MPAS, PA-C
Physician Assistant
Specialty: Advanced Practice Provider
Ashley joined HCWP in 2025 as a physician assistant. She received a Bachelor of Science in Rehabilitation Science in 2022, and a Master of Physician Assistant Studies in 2024, both from the University of Pittsburgh.
Read MoreAshley joined HCWP in 2025 as a physician assistant. She received a Bachelor of Science in Rehabilitation Science in 2022, and a Master of Physician Assistant Studies in 2024, both from the University of Pittsburgh. She also has a certificate in Pathokinesiology in Rehabilitation. During her time in school, she worked as a nursing assistant, medication technician, physical therapy technician, and teaching assistant. Ashley is originally from Pittsburgh, and she is so excited to practice so close to home. Ashley sees both adult and pediatric patients at HCWP. She is looking forward to getting involved with hemostasis research and musculoskeletal ultrasound techniques to better serve our patient population. Outside of work, Ashley enjoys cooking, baking, and spending time with family.
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Nina Depp, FNP-BC, MSN, RN
Nurse Practitioner
Specialty: Advanced Practice Provider
Nina joined the Hemophilia Center of Western PA in March 2026 as a Nurse Practitioner.
Read MoreNina joined the Hemophilia Center of Western PA in March 2026 as a Nurse Practitioner. She is enthusiastic about delivering care and musculoskeletal ultrasound to patients and families across the lifespan with bleeding disorders.
Nina earned her Master of Science in Nursing from Carlow University in 2023 and is board certified through the American Nurses Credentialing Center. As a Nurse Practitioner, she has worked in outpatient internal medicine, treating patients with a broad range of acute and chronic health conditions.
Her nursing background spans 7+ years and includes experience primarily in the Neonatal Intensive Care Unit at West Penn Hospital. As well as adult surgical stepdown at the VA Pittsburgh Healthcare System, and adjunct clinical nursing instructor at the West Penn Hospital School of Nursing.
Outside of the clinic, Nina enjoys spending time outdoors and traveling to beach and mountain destinations.
Genetic Counseling
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Bruce Haas, MS, LCGC
Licensed Genetic Counselor
Specialty: Genetic Counseling
Native to Wisconsin, Bruce completed his undergraduate degree at Marquette University. Following years of working as a technologist in genetic laboratories he completed his genetic counseling training at Sarah Lawrence College.
Read MoreNative to Wisconsin, Bruce completed his undergraduate degree at Marquette University. Following years of working as a technologist in genetic laboratories he completed his genetic counseling training at Sarah Lawrence College. Upon graduation he was employed by the Division of Pediatric Hematology at The New York Hospital which is where he began his service to Hemophilia Treatment Center families. After four years at Memorial Sloan-Kettering Cancer Center, he became the Associate Director of the Genetic Counseling Graduate Program at his alma mater. In 2014, given his years of work in hematology, he was recruited to co-coordinate the Thalassemia Screening Program for NCAL Kaiser Permanente. Bruce is married and has an adult step-daughter and step-son. He met his spouse when each joined the same New York City chorus.
Licensed Clinical Social Worker
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Kathaleen M. Schnur, LCSW
Licensed Clinical Social Worker Mental Health Professional
Speciality: Social Work
Kathaleen joined the Hemophilia Center of Western Pennsylvania in 2013.
Read MoreKathaleen joined the Hemophilia Center of Western Pennsylvania in 2013. Kathaleen has a master’s degree in social work from the University of Pittsburgh. She serves on several national professional groups and educational planning committees for both professionals and consumers. Kathaleen works closely with the local chapter of NHF to develop and plan targeted education to the community. She has co-organized new parent groups, teen groups, carrier groups, and education weekends, and is also the co-director of Camp Hot-to-Clot. Kathaleen was the recipient of the National Hemophilia Foundation’s Social Work Excellence Fellowship in collaboration with three of her national cohorts. When with her family, Kathaleen loves being outside with her husband and two children, looking after her backyard chickens, and going on family road trips.
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Katherine Bush, LCSW
Licensed Clinical Social Worker Mental Health Professional
Specialty: Social Work
Katherine earned her Master of Social Work from the University of Maryland.
Read MoreKatherine earned her Master of Social Work from the University of Maryland. She has prior work experience as a case manager, outpatient therapist, residential treatment therapist, and behavior specialist. Katherine joined the HCWP in 2017 and has been enjoying getting to know the patients ever since. Katherine is one of the co-directors of Camp Hot-to-Clot, helps facilitate the Consumer Advocacy Committee, and also coordinates the teen group together with the Western Pennsylvania Bleeding Disorders Foundation. When not working, she enjoys spending her spare time knitting, cooking, spending time with her husband, and playing with her two sons
Nursing
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Tatum Donahue, RN
Clinical Nurse Nurse Supervisor
Specialty: Nursing
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Richard Yost
Clinical Nurse
Specialty: Nursing
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Nicholas Paluselli
Clinical Nurse
Specialty: Nursing
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Christina Cherkes, RN
Clinical Nurse
Specialty: Nursing
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Mathhew Staub, RN
Clinical Nurse
Specialty: Nursing
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Jess Chatta, RN
Clinical Nurse
Specialty: Nursing
Physical Therapy
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Clayton Kubrick PT, DPT, RMSK
Doctor of Physical Therapy Registered in Musculoskeletal Sonography
Specialty: Physical Therapy
Clayton joined the HCWP in 2023 as the Center’s physical therapist.
Read MoreClayton joined the HCWP in 2023 as the Center’s physical therapist. Clayton received his Bachelor's of Science in Biology and Chemistry from the University of Pittsburgh at Johnstown in 2012, and his Doctorate in Physical Therapy from Wheeling Jesuit University in 2015. He has been practicing in the greater Pittsburgh area since graduating in both outpatient and home health. During this time, his primary focus was orthopedic pre/post operative, sports injury, and vestibular rehabilitation. He also has multiple years of experience in management as a director of an outpatient clinic.
Clayton uses current evidence-based practice during his assessment to determine a precise diagnosis and plan of care. He has a strong understanding of orthopedics and holds the Registered in Musculoskeletal Sonography (RMSK) credential, demonstrating advanced expertise in diagnostic musculoskeletal ultrasound. He has always had a passion for treating and learning about patients with bleeding disorders from his family history of hemophilia and von Willebrand’s disease.
A soccer player in college, he still enjoys playing competitively. Some of Clayton’s other interests involve fly fishing, cooking, gardening, and spending time with his family. Clayton is a Pittsburgh native and currently resides in Allison Park with his wife, two kids, and German Shepherd dog.
Research
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Dana Ivanco, CCRC
Sr. Clinical Research Coordinator
Specialty: Research
Dana joined the HCWP research team in early 2019.
Read MoreDana joined the HCWP research team in early 2019. Her medical background started with Emergency Medicine in 1996, and after her move to Pittsburgh in 2000 she began her career in research at the University of Pittsburgh. She has been a Certified Clinical Research Coordinator for the past nineteen years; and has done patient care, budgeting, regulatory work with Phase I-IV studies. She has been on the local ACRP board for Clinical Researchers since 2007 and remains active today. She also serves as a committee member with our local IRB.
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Deborah Vehec, RN
Research Nurse
Specialty: Research
Debbie has been with Vitalant (formerly ITxM) for 5 years, joining the HCWP research staff in 2019.
Read MoreDebbie has been with Vitalant (formerly ITxM) for 5 years, joining the HCWP research staff in 2019. She earned her MSN at Waynesburg University. For over 39 years, Debbie worked at UPMC McKeesport as a staff nurse in the CCU, eventually becoming Unit Director of Stepdown, CCU and ICU before accepting a position at ITxM as the Manager of Special Programs. In this position, she worked closely with the National Marrow Donor Program in recruiting and guiding the donors as they donated marrow or stem cells anonymously to patients in need of a transplant for various blood cancers.
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Alyssa Rogalski, RN
Research Nurse
Specialty: Research
Alyssa joined HCWP as a research nurse in 2025. She received her Associate of Science in Nursing (ASN) in 2019 and Bachelor of Science in Nursing (BSN) in 2022, both from La Roche University.
Read MoreAlyssa joined HCWP as a research nurse in 2025. She received her Associate of Science in Nursing (ASN) in 2019 and Bachelor of Science in Nursing (BSN) in 2022, both from La Roche University. Her background includes inpatient nursing at Allegheny General Hospital on the General Surgery/Trauma unit as well as experience working with gastroenterology procedures in the GI lab. She has worked as a research nurse at the Allegheny Singer Research Institute covering hematology, neurology, and head/neck malignancy clinical trials. Outside of work, Alyssa enjoys staying active and spending time with family, friends, and her two cats.
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Julie Jaworski, RN
Research Nurse
Specialty: Research
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Jessica Izenas
Clinical Research Associate
Specialty: Research
Administration
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Ed Smith, MS, MBA, CGC
Executive Director
Specialty: Administration
Ed joined the Hemophilia Center of Western Pennsylvania (HCWP) as Executive Director, in October 2025.
Read MoreEd joined the Hemophilia Center of Western Pennsylvania (HCWP) as Executive Director, in October 2025. In this leadership role, Ed oversees the launch of new services and strengthens partnerships with health care providers across the hemophilia treatment center region. Ed brings more than 15 years of experience integrating genomic technologies into large health systems, advancing personalized medicine, and leading cross-functional teams. Most recently, he served as Head of Clinical Omics Services at Psomagen, Inc., in Maryland. Prior to that, he spent 15+ years at the University of Pittsburgh Medical Center (UPMC) enterprise in roles including Senior Director of the UPMC Genome Center, Director of Laboratory Services Center - Genetics, and Administrative Director of the Department of Genetics at UPMC Magee-Womens Hospital.
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Jeff Wahal, MBA
Operations Director
Specialty: Administration
Jeff joined The Hemophilia Center of Western Pennsylvania in 2012 and serves as the Director, Operations.
Read MoreJeff joined The Hemophilia Center of Western Pennsylvania in 2012 and serves as the Director, Operations. In this role, he pursues the Center’s strategic direction and manages the day-to-day business operations. He has over twenty years of experience with various roles in the accounting, finance and business administration fields, including twenty-seven years in the medical community. Prior to joining the Center, Jeff worked for ZOLL Medical’s LifeVest unit and was responsible for the Company’s financial reporting and planning. Previously, Jeff held the roles of Finance Manager and Controller at Precision Therapeutics and invivodata, respectively. Jeff has a bachelor’s degree in accounting from The Pennsylvanian State University and a master’s degree in business administration from The University of Pittsburgh.
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Diann Keebler
Administrative Assistant
Specialty: Administration
Diann joined HCWP in 2016.
Read MoreDiann joined HCWP in 2016. She is a Navy Veteran who attended the Naval School of Dental Assisting and Technology in San Diego, CA. She cross trained as a Navy Corpsman doing blood draws and immunizations. She has worked in every aspect of a Dental Office from front desk to assisting the dentist to ordering supplies to billing insurance and patient collections.
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Devera Hoblak
Administrative Assistant
Specialty: Administration
Devera joined HCWP in 2020.
Read MoreDevera joined HCWP in 2020. She is a Navy Veteran who served on the USS Cape Cod as a Hospital Corpsman. She has an Associate Degree in Business. Devera has extensive administrative experience and has worked at UPMC as the Administrative Coordinator to the CIO and at Management Science Associates as the assistant to the VP of IT and other managers and support staff in the IT Department.
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Patricia Linn
Administrative Assistant
Specialty: Administration
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Angela Messina
Administrative Assistant
Specialty: Administration
Medical Assistant
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Denise Proakis
Medical Assistant
Specialty: Medical Assistant