Kerri Winters-Stone, Ph.D., FACSM
Principal Investigator

An exercise physiologist by training, my expertise is on the use of physical activity to prevent and manage chronic disease. My studies have shown that cancer survivors can benefit from exercise that reverses treatment-related side effects and symptoms. Ultimately the goal of my work is to develop safe, targeted and effective exercise programs that translate well to community settings and clinical practice so that people can make positive lifestyle choices for better long-term health.

Carolyn Guidarelli, M.P.H., CCRP
Senior Clinical Research Associate and Lab Manager

From an early age, and due to personal family experiences with cancer, I knew I wanted to dedicate my career to making life better for patients with cancer. After completing my undergraduate degree at the University of Portland, I pursued a Master of Public Health in Epidemiology from Boston University where my studies focused on non-infectious, chronic diseases, such as cancer. Having grown up in Oregon and being an avid sports enthusiast, I jumped at the opportunity to return to the Pacific Northwest and engage in research that combines two things close to my heart: exercise and cancer. I have witnessed first-hand how therapeutic the right exercises can be, especially in the lives of those affected by cancer. I have been working in Dr. Kerri Winters-Stone’s Exercise Lab since 2012 and I am proud to be a part of a team that is leading the charge in developing evidence-based exercise programs that may one day be an integral and complimentary part of routine clinical cancer care. As the lab manager, I oversee a multitude of grant-funded trials, manage an ever-growing team, contribute to scientific development, data management and analysis, and dissemination of our findings. I stay active with my husband and our two young kids in my free time.

Jessica Sitemba, M.S.
Clinical Research Associate

Since obtaining my master's degree in exercise science in 2006, I have been blessed with the opportunity to work as a project director on multiple exercise intervention studies aimed at using exercise to improve symptoms and side effects from cancer and cancer treatment, ultimately improving quality of life for many cancer survivors. I have seen firsthand what exercise can do for this population and am thrilled to continue working on these types of studies as long as possible with the ultimate goal of implementing the classes into the community for all cancer survivors to benefit from. As a research associate, my main role is to manage the exercise interventions for multiple trials.  This includes assisting in the initial design of the programs, instructor training and management, and overseeing the overall progress and conduct of the exercise classes.

Stephanie Krasnow, Ph.D.
Project Director

After earning a Ph.D. in physiology and biophysics from the University of Washington, I spent a decade at the bench studying the central nervous system pathways that disrupt appetite, metabolism, and neuroendocrine function during acute and chronic illnesses. I was trained in clinical and translational cancer research by completing a Brenden-Colson Center for Pancreatic Disease fellowship and earned a certificate in Human Investigations. My research is focused on identifying predictors of treatment-related side effects and strategies to mitigate their negative impact on clinical outcomes and quality of life in patients with cancer. As a project director, I oversee the design, conduct, and analysis of an observational study examining neuropathy and mobility deficits in patients with cancer that are treated with neurotoxic chemotherapy.

Deanne Tibbitts, Ph.D., MCR
Assistant Research Professor 

I grew up in Georgia, where I earned my bachelor’s degree in genetics and cellular biology at the University of Georgia. I then moved to Portland and completed my Ph.D. in molecular and medical genetics at OHSU studying the molecular basis of leukemia and the application of targeted cancer therapeutics. I went on to complete a certificate in Human Investigations at OHSU and an NCCIH-funded clinical research fellowship in complementary and integrative health at the National University of Natural Medicine. During my fellowship, my research focused on using mind-body interventions, including trauma-informed yoga and yoga nidra, to improve emotional well-being. In the Winters-Stone Exercise Lab, my work focuses on the use of exercise and mind-body interventions to improve psychosocial outcomes and quality of life in cancer survivors.

Sharon McCoy, M.S.
Clinical Research Associate

After earning a master’s degree in clinical exercise physiology, I spent numerous years in basic science research and biotechnology. I transitioned to clinical research by becoming a project coordinator for an aerobic exercise study in people with multiple sclerosis at OHSU.  I’m now the project director for iLIVE, a diet and exercise study in men with prostate cancer, in the Winters-Stone exercise oncology lab. I am passionate about the use of health practices such as exercise, nutrition, sleep and meditation to both prevent and cure disease. I’m so excited to be part of the Winters-Stone lab and the iLIVE project, and to contribute to the goal of improving the quality of life in cancer survivors.

Mary Crisafio, M.S.
Clinical Research Associate

Mary is an exercise physiologist who has worked within the military, aging, cognitive and oncology fields. She has a bachelor's degree exercise science from Baldwin Wallace University, and a master's degree in human performance from the University of Pittsburgh. She is currently finishing her doctorate in human bioenergetics at Colorado State University, where her focus has been on physical activity maintenance in cancer survivors, as well as using exercise as standard care in treatment and throughout survivorship. Mary also serves on the Moving through Cancer initiative. At OHSU, Mary will be working on the ACES initiative to help build a framework for integrating exercise into cancer care for older adults.

Sydnee Stoyles, MBST, MAT
Biostatistician 2

I have always wanted a career where I could help others. After a few years in secondary education as a math teacher, I realized the classroom was not the fit I was hoping it would be. I returned to school and received my master's degree in biostatistics from OHSU’s School of Public Health in 2015. I have worked under Dr. Nathan Dieckmann at the OHSU School of Nursing since 2015. There I have been able to assist on a variety of projects including improving nursing education, fall prevention, post-partum depression, and understanding chronic pain in adolescents, as well as exercise intervention trials with the Winters-Stone lab. My work focuses on data management and analysis. I participate in creating analysis plans, preparing data, and running analyses as well as contributing to posters and manuscripts. I am grateful for the opportunity to work with Dr. Winters-Stone’s lab where I can contribute to the lab’s work on improving quality of life and well-being for cancer survivors.

Christopher Chalmers, M.S.
Senior Clinical Research Assistant

I worked as a personal trainer for years, coaching a myriad of different clientele from collegiate athletes to retired veterans. After finishing my bachelor's degree, I worked in military physiology research, where our efforts were to improve the efficiency and safety of our soldiers. Subsequently, I received a master’s degree in exercise and sport science at Merrimack College where my thesis focused on the effects of seated load carriage on the soldier's physical and mental performance. Now, I am fortunate to work with an amazing team at the Winters-Stone Exercise Lab, learning, and researching how exercise plays a critical role in cancer survivorship. Cancer has affected everyone to some degree, and seeing how our work positively affects cancer survivors brings me immense fulfillment. As a research assistant, I recruit research participants, schedule and conduct data collection appointments, and ensure survey completion. I also manage the ever-evolving technology aspects of study involvement and help facilitate access and support to our participants across trials.

Thais Denmark, Ph.D.
Senior Clinical Research Assistant 

I am from Brazil and completed my Ph.D. in the science of human motor skills with a focus on physical activity and health. I completed my Ph.D. internship at Oregon Health & Science University with Dr. Kerri Winters-Stone in 2016 and 2017. I have a background in clinical research studying the effects of combined exercise (resistance and aerobic) programs on body composition and quality of life in breast cancer survivors. As a senior research assistant on Dr. Winters-Stone's exercise trials for cancer survivors and the elderly. I work on the development and delivery of exercise programs, instructor training, and overseeing the overall progress and conduct of the exercise classes. I believe that exercise can help people to get healthy and live longer and I see exercise as medicine. I am sure that the work our team does contributes to incorporating exercise as a standard of care for all cancer survivors.

Jaime Santos, B.S.
Clinical Research Assistant II

I graduated from the University of Oregon in 2023 with a bachelor's degree in human physiology. During my undergrad, I served as a performance and sports science intern for UO Athletics. Upon graduating, I knew that I wanted to continue gaining experience in exercise physiology and research. I am excited to be with the Winters-Stone Exercise Lab as it blends two of my passions: exercise and research. I believe exercise should be accessible to everyone, which is a value that the Winters-Stone Exercise Lab characterizes in their work and mission. As a research assistant, I recruit research participants, schedule and conduct data collection appointments, and ensure survey competition.

Alan Trinh, B.S.
Clinical Research Assistant II

I graduated from the University of Oregon in 2023 with a degree in human physiology. My journey led me from being an emergency medicine scribe to my current role as a research assistant at the Winters-Stone Exercise Lab. During my time as a scribe, I developed a profound interest in the medical decision-making process, inspiring my pursuit of becoming a physician. My primary areas of interest lie in physiatry and oncology, fueled by both my love for exercise and personal family experiences with cancer. The Winters-Stone Exercise Lab's mission perfectly aligns with my intersection of interests, and I feel blessed to be a part of this team. As a research assistant, I recruit research participants, schedule and conduct data collection appointments, and ensure survey completion. Beyond my professional pursuits, I find joy in exercising, cooking, and cherishing quality time with my loved ones.

Christopher Barnes, PT, D.P.T., Ph.D.
Postdoctoral Scholar

Chris is a physical therapist and health services researcher who specializes in improving access to physical rehabilitation for people with cancer. He earned a Doctorate of Physical Therapy at Northern Arizona University in 2016 and a Ph.D. in Rehabilitation Science from the University of Utah in 2022, and joined the Winters-Stone Exercise Lab as a postdoctoral scholar in August 2023. Professionally, he focuses on ways to provide barrier-free physical rehabilitation care for all people with cancer. In his non-work time, he enjoys playing good music for his houseplants and taking walks. Chris will be working with the PACS team to learn more about how older people with cancer think and feel about digital technology, exercise, and physical activity.