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Karen Callahan has extensive work experience in the medical field, particularly in the areas of hematology and oncology. Karen currently holds the position of Director of Research Operations at Hematology-Oncology Associates of CNY, which they started in 2022. Prior to this role, they were an Associate Director of Nursing at Upstate Cancer Center from 2016 to 2023, where they also served as an Assistant Director of Nursing from 2016 to 2019. Before joining Upstate Cancer Center, Karen worked as a Practice Manager Division of Hematology/Oncology at SUNY Upstate Medical University Department of Medicine from 2015 to 2016. From 2012 to 2015, they were a Nurse Administrator at SUNY Upstate Medical University. Karen's earlier experience includes working as a Clinical Research Manager and a Clinical Trials Research Nurse at Hematology/Oncology Assoc. of CNY from 2008 to 2012. Karen started their career at SUNY Upstate Medical University in 2001 as a University Physician's- Hematology/Oncology, a role they held until 2007.

Karen Callahan has a diverse education history. Karen started their academic journey by earning an Associate's Degree in Early Childhood Education from The Sage Colleges-Sage College of Albany from 1989 to 1991. Later, in 1996 to 1998, they pursued a degree in Nursing and completed an Associate's Degree from SUNY Morrisville. Building upon their nursing qualifications, Karen obtained a Bachelor of Science (BS) in Nursing from Keuka College, studying there from 2007 to 2009. To further enhance their expertise in nursing education, they completed a Master's Degree in Nursing Education, specializing in that field from 2013 to 2015, also at Keuka College.