During Dr. Herrington’s 20 year career in Radiation Oncology, she still shares her passion of delivering compassionate care to her patients, which is the reason she was initially drawn to the specialty of cancer care.  Dr.  Herrington joined the Grand Lake Regional Cancer Center and the Allison Radiation Oncology Center at St. Rita’s Medical Center in 2008. Dr. Herrington has extensive experience treating many cancers, and is specifically interested in utilizing medications and treatment techniques that minimize side effects while maintaining effectiveness of treatment.

Dr. Herrington was born in Michigan and has lived most of her adult life in Ohio.  She is a veteran of the US Air Force, and was previously a Captain at Wright Patterson Air Force Base, in the Radiation Oncology Department.  Dr. Herrington earned her Medical Doctorate and a Doctor of Philosophy from the University of Kansas and completed her residency at University Hospitals of Cleveland.

Married to Dan, she has two adult children, Eric and Becky.  In her spare time, Dr. Herrington enjoys the outdoors, listening to wild turkeys and ducks, watching birds, and gardening. She loves to beautify her surroundings, including her pond front home in Shawnee.

Michael Bishop, MD

I am a radiation oncologist and treat multiple cancer sites. Some of my most commonly treated areas include head and neck, lung, colorectal and breast cancers. I utilize the latest radiation therapy technology to deliver conventional and hypofractionated treatments, focal high dose ablative stereotactic body radiation therapy and stereotactic radiosurgery procedures. I enjoy spending time with my family, traveling and enjoying the outdoors.

Lauren Setzkorn, PA-C

As a certified, licensed physician assistant (PA), Lauren feels honored to serve the cancer patients of her community at the Grand Lake Regional Cancer Center and at Allison Radiation Oncology Center at St. Rita’s Medical Center. Lauren is grateful to work in radiation oncology—a field that utilizes modern technology to help patients fight cancer—because she is passionate about educating her patients and compassionately caring for them through their cancer diagnosis and treatments.

“The most rewarding aspect of oncology is walking alongside my patients through their cancer journey,” Lauren shares. “I love that I can build relationships with my patients through the course of their treatments and survivorship. I feel honored to support them, as I explain to them their diagnosis, help them make the best decisions for them, and encourage them through treatments.”

In her free time, Lauren enjoys spending time with friends and family, serving with church, traveling, reading, and baking.

Tyler Wiedeman, PA-C

I first became interested in becoming a physician assistant when I had a sports injury early in high school. I interacted with several PAs throughout my recovery and their role in health care intrigued me. While working as a PA, I enjoy the opportunity it provides to meet new people and make a positive impact on their lives through healing. I am honored to be able to play a role in the treatment team while helping navigate the various hurdles of a cancer diagnosis.

In my free time, I enjoy spending time with my family, golfing and watching sporting events.

Dan Goecke, B.S., CMD

Dan has lived in Spencerville for 35 years. He graduated from Spencerville High School and studied at the University of Cincinnati. He has worked at Grand Lake Regional Cancer Center since 2005 as a Dosimetrist, doing computer-based treatment planning.

Dan is married to Sara, and together they have five children: four girls and one boy. In addition to being a Dosimetrist, Dan is a part-time farmer on his family farm.

Heidi Thees, Secretary

Heidi lives in Celina. She graduated from Celina High School and attended Wright State University, where she majored in medical office. She has worked at Grand Lake Regional Cancer Center since it opened in 2004.

Heidi is married to Tim, and together they own a small business within the Celina community. The couple has two children, Derek and Sara.

Heidi enjoys spending time with her family and friends, camping, working out, and has an extreme passion for working with the special needs community. Of her job at Grand Lake, she says, “I have the honor of working with a very caring and compassionate staff. Together, we treat patients ‘as a person and not a number!’”

Mary Jo Dues, RN, Radiation Oncology Nurse

Mary Jo lives on a farm in St. Henry. She graduated from Lima Technical College as a Registered Nurse. Mary Jo has experience in emergency, family practice and hospice in addition to oncology. She has worked at Grand Lake Regional Cancer Center since 2006.

Mary Jo has been married to her husband Mark since 1989. Together they’ve had the joy of raising four children. Mary Jo’s hobbies include gardening, camping, biking, hiking, and spending time with her family and friends.

Kellie Pearson, RT(R)(T), Radiation Therapist

Kellie lives in Celina, and graduated from Rhodes State College with an Associate Degree in Applied Science Radiography and from Washburn University with a degree in Radiation Therapy. She has worked at Grand Lake since 2004.

Kellie has been married to her husband Jason since 2003. They have three kids, Gavin, Bria, and Alexa. Kellie loves to attend her kids sporting events, and enjoys staying fit and healthy herself. She does CrossFit to stay in shape. Additionally, she loves to spend time with her friends and family.

Mandy Fleck, RT(R)(T), Radiation Therapist

Mandy lives in the Marion Local School District. She graduated from Sinclair Community College with an Associate Degree in Applied Science for Radiography and from University of Cincinnati with a degree in Radiation Therapy. Mandy has worked at Grand Lake since 2004.

Mandy has been married to husband Lester since 1997. They have four children, Collin, Sarah, Logan, and Sophia. Her hobbies include spending time with family and friends. She also loves the outdoors and cheering her kids on at their sporting events.

Jill Otte, RT(T), Radiation Therapist

Jill grew up in Fort Recovery and lives in Minster. She graduated in 2008 from Ball State University with an Associate Degree in Radiation Therapy and has worked at Grand Lake since 2009.

Jill has been married to her husband Douglas since 2010. Together they have three children, Aleah, Adalyn, and Dylan. Jill enjoys gardening, taking walks with family, and doing crafts. She also loves to decorate for the holidays. Of Grand Lake, she says, “We have a great staff and I really enjoy working with them.”

Karen Homan (RD, LD) Registered Dietician

Karen worked at GLRCC from 2005-2008 and rejoined our team in 2017. She obtained her Bachelor of Science in Health and Sports Studies from Miami University in Oxford, Ohio, in 2000. She completed a dietetic internship at Ball Memorial Hospital in Muncie, Indiana in 2001.

She lives in Chicasaw, Ohio, with her husband Bart and their five children: Brandt, Clara, Eva, Garret and Sierra. When she is not working, Karen enjoys being outdoors and staying physically active, cooking and trying new foods, playing with her children and spending time with friends and family.