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The Team

Who We Are

Our Team

We are here to partner with our patients and their families to provide quality vision care. We understand each individual is unique and that is why we tailor our care to each patient to develop vision and the visual skills necessary for life’s journey. 

Dr. Tina

Dr. Tina Schiller


Dedicated, enthusiastic, caring, and positive, Dr. Tina’s passion is helping her patients achieve their full potential through vision. She provides eye care for pediatric patients from infancy through teenage years and vision therapy for children struggling with vision problems that interfere with their ability to read, learn, and maintain attention as well as adults struggling with their vision after a head injury or stroke.

Dr. Tina received her undergraduate degree in 2009 from The University of Southern California where she graduated Summa Cum Laude. In 2014, she earned her Doctor of Optometry from Southern College of Optometry where she graduated as Valedictorian. Following graduation, Dr. Tina completed a residency in Pediatrics and Vision Therapy. She earned her Fellowship in the College of Optometrists in Vision Development.

Dr. Tina believes in the importance of service, and she has served on five international trips providing eye care and glasses to thousands of patients in Mexico, Colombia, Jamaica, and Belize while also maintaining involvement at home in Special Olympics Opening Eyes. Dr. Schiller is a member of the American Optometric Association, College of Optometrists in Vision Development, Optometric Physicians of Washington, and King County Optometric Society. When she’s not in the office, she enjoys hiking, skiing, running, sports and trying to keep up with her three young kids and husband, John.

Dr. Katie Hash


Calm, flexible, and caring, Dr. Katie adores working with children of all ages and abilities. She is a California native, but has called the Pacific Northwest home since 2016. She enjoys knitting, baking, attempted gardening, all things Disney, and spending time outdoors with her husband and two sons. Dr. Katie received her bachelor’s degree in biology in 2011 from the University of California, Los Angeles. In 2016, she earned her Doctor of Optometry from Western University of Health Sciences, graduating with honors.

Dr. Katie serves as the Washington state Clinical Director of Opening Eyes, the vision screening arm of Special Olympics, and is a past president of King County Optometric Society. She is board certified in vision development and vision therapy and has a passion for partnering with children and their families to reach their visual goals. She has a special interest in strabismus, amblyopia, and how vision impacts learning.

Dr. Katie

Ginger Wheeler

Vision Therapist

Ginger is originally from Richmond, Virginia, where she completed her Bachelor’s in Communication at Virginia Commonwealth University. After college, she moved to the United Kingdom, where she met her husband and had three children, who are now fully grown. She attended the Royal Society of Arts in London, gaining certification as a Fitness Professional. While teaching step aerobics and strength training classes, she recognized her passion for educating and coaching others to achieve their goals. In 2009, her family moved to the Seattle area, where she discovered vision therapy and knew her skill set would be a perfect fit. Ginger has a decade of experience working as an Optometric Vision Therapist. She builds rapport with patients of all ages who struggle with visual challenges and helps to improve communication between the eyes and the brain. Outside of work, she and her husband together enjoy hiking and biking, gardening, cooking, and relaxing by their firepit with friends and family.

Diana Anderson

Vision Therapist

Diana grew up in Utah and moved to Washington state over 14 years ago where she is now raising her family. She focused her high school and college years around childcare and education and has spent countless hours volunteering in elementary schools, nannying, tutoring and lesson planning. A highlight experience for her was living in Voronezh, Russia for a semester and teaching English in an elementary school.

She has worked as a vision therapist for over 3 years and absolutely loves this field. Diana’s motto in therapy is “Set Them Up For Success.” She finds it so rewarding to see a patient move from a place of struggle to a place of confidence and achievement. Being a witness to some patients literally learning to see the world in a different way has been an honor for her.

Outside of work, she spends most of her time with her 3 kids and makes sure chocolate is part of her daily diet. She also likes strategy board games, playing the piano and ukulele, and reading.

Kelsey (K1)

Kelsey Ferguson

Vision Therapist

Kelsey is from the San Francisco Bay Area and holds a Bachelor’s of Science in Public Health from San Diego State University. She recently relocated to the Pacific Northwest because she loves the incredible scenery and the rainy weather. As a vision therapist, she is excited to create a warm and fun environment during her sessions, and help her patients achieve their goals and improve their visual skills. In her spare time, Kelsey enjoys reading, hiking, swimming, baking, and photography. Being new to the PNW, she is always open for trail recommendations or the best place to devour a donut.

Nikki VanderWood

Vision Therapist

An Issaquah native, Nikki is so happy to be a part of the Summit Vision team. After graduating from Pacific Lutheran University with a Bachelor’s of Arts in Elementary Education and a Minor in Psychology, she taught 5th grade in Tacoma before moving back to the Issaquah area to be closer to family. As a vision therapist, she strives to make connections with her patients and to help them develop skills that they can use both in and out of the clinic to achieve their goals. Outside of work, you can often find her watching a movie with her dog and cat, baking, finding good music, or exploring different Washington cities looking for an adventure.


Kalli Allen

Vision Therapist

Kalli grew up near Ann Arbor, Michigan and attended Michigan State University for her Bachelor’s in Music Education. While at MSU, Kalli conducted the Community Music School’s Children’s Choir, taught Early Childhood Music, and was a local church’s Children’s Choir director. After college, Kalli returned to Ann Arbor where she taught Elementary Music for two years. While in Ann Arbor, she participated in local musical theater as both a performer and a music director. In 2020, Kalli moved to Seattle and taught Elementary Music in Edmonds for a year before returning back to Michigan to take care of an ill family member. While back in Michigan, she decided to explore careers outside of teaching that still allowed her to be a supportive force to others; enabling them to reach their goals. Vision Therapy directly reflected this, and she’s been smitten ever since. While not at Summit Vision Center, you can find Kalli on stage singing in a local production, skiing down a mountain, roasting a bird in her oven, or losing at chess.

Maggie Higgenbotham

Office Manager

Originally from Georgia, Maggie graduated from Emory University with B.A.s in English and Creative Writing, and Theater Studies. Her desire for cooler weather and beautiful scenery brought her to the Pacific Northwest in 2023, where she is also pursuing writing and theatre directing. In her spare time, Maggie enjoys reading, playing board games, and is looking forward to discovering the local geocaching scene!


Joni Cantrell

Patient Care Coordinator

Joni was born and raised in the beautiful Puget Sound area of Washington State. She has worked as a patient care coordinator in the optometric vision therapy field for over three decades and absolutely loves making a difference in people’s lives. She has three stepchildren who are fully grown and has two dogs and two kitties. Outside of work, she loves to go fishing, hiking and playing tennis with her husband Chip. She also enjoys spending time with friends and her family and roots for the Mariners every chance she gets!

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