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Providing YOU with the BEST Therapists for the BEST CARE

Dr. Amanda Thome, PT, DPT 
  • Vestibular/Concussion
  • Sacroiliac Disorders-Hesch Sacroiliac Practitioner
  • Mulligan Trained Upper & Lower Quarter
  • Upledger Craniosacral 
  • Chronic Pain disorders
  • Maitland Trained-Spine
Amanda graduated magna cum laude with her Doctorate in Physical Therapy from Columbia University in 2010. Amanda got her bachelors in science degree from Ursinus College in Collegeville, PA in 2007. During her time at Ursinus College Amanda was a NCAA track and field athlete. 

Since graduating Amanda has trained for and completed three full marathons. She continues to stay active through cycling and riding her horse Chinook.
In the clinic, Amanda uses skills she gained working for nationally top-ranked rehabilitation facilities and the skills she continues to develop through rigorous continuing education training. Amanda has a strong background in manual therapy and the treatment of acute and chronic pain conditions. Amanda is an ImPACT concussion trained physical therapist and has dual certifications in Vestibular and Concussion therapy through the American Institute of Balance (AIB-VRC). Amanda has taken continuing education training in the Mulligan and Maitland techniques, TMJ disorders, cervicalgia and headache disorders as well as Upledger craniosacral therapy and is a Hesch Sacroiliac Practitioner (HSP).
 It is Amanda's belief that each patient presentation and treatment interventions are unique. and need to be tailored to that person. 
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Dr. Vashti Graphenteen , PT, DPT 
  • Women’s Health and Female Pelvic Floor Dysfunction
  • Myofascial Release
  • Sacroiliac Joint Disorders – Hesch Sacroiliac Practitioner
  • Upledger Craniosacral
  • Mulligan Trained Upper Quarter
  • Cancer Rehabilitation
  • Acute and Chronic Pain
Vashti received her Bachelor of Science Degree in Exercise Science from Minnesota State University, Mankato and went on to receive her Doctorate in Physical Therapy from the University of South Dakota in 2013. She has worked in several different rehab facilities primarily treating various orthopedic and chronic pain conditions. She has also worked alongside a team of providers dedicated to cancer rehabilitation and lymphedema management. Over the last five years, Vashti has developed a passion for women’s health, working with women across the lifespan, to address complex issues like pelvic and low back pain, bowel and bladder dysfunction, pregnancy care and postpartum recovery. She continues to advance her skills via continuing education courses in hopes of better guiding and assisting her clients in their rehab journeys.

Vashti is dedicated to optimizing health and wellness in individuals of all ages. Her primary goal is to help maximize quality of life and functional mobility by tailoring each patient’s treatment plan specifically to their needs. She recognizes that patients often warrant a multifaceted approach and strives to support each of her patients on their unique road to recovery. When Vashti is not at Cornerstone, she’s spending time with her family, enjoying the outdoors, walking her dog, working out, cooking, or reading a good book
Dr. Matthew Somerville, PT, DPT
  • Orthopedics

  • Acute and chronic pain

  • Balance and fall prevention

  • Post Surgical Rehabilitation

  • Neurological Rehabilitation

  • Wound care.

Matt graduated from State University of New York with a BA in Science 2002. To the benefit of his patients and peers he found his way into Physical Therapy after graduating with his Doctorate in Physical Therapy from Shenandoah University in Northern Virginia in 2012. After becoming a PT he spent extensive time studying and practicing to become a wound care specialist for which he became certified after two years of training. Matt joins the Cornerstone team bringing his strong interpersonal skills, manual therapy skills and effective exercise prescriptions for the various clients and conditions we see. When not at Cornerstone Matt can be found skiing, mountain biking, sailing, whitewater kayaking and spending time with his wife and children taking in all that North Idaho offers.
Dr. Kerby Andersen, PT, DPT
  • Certified Dry Needling

  • Strength and Conditioning

  • Blood Flow Restriction Training

  • Orthopedics

  • Injury Prevention

  • Balance and Fall Prevention

Kerby is a 2020 honors graduate from Rocky Mountain University of Health Professions where he earned his Doctorate in Physical Therapy. Prior to his graduate studies Kerby received his Bachelors of Science degree in Health and Wellness, Exercise Sciences with a business administration minor from Eastern Oregon University in 2015. Throughout his undergraduate studies at Eastern Oregon Kerby was a NAIA track and field athlete as a short sprint specialist and pole vaulter.
Since earning his Doctorate in Physical Therapy Kerby continues to pursue additional education with a driven desire for lifelong learning. Kerby has received additional certification as a trained Dry Needling provider in 2021 and has prior certifications as a certified personal trainer and Idaho highschool track and field coach. He enjoys working with orthopedic conditions, injury prevention, strength and conditioning, and balance related deficits.
With a large and varied background of personal interests, work, and athletic experience outside the field of physical therapy, Kerby believes each patient has unique and individualized needs that require personalized plans of care. Kerby utilizes functional movements and treatments with the belief that form follows function.
Dr. Alexis Creighton, PT, DPT


  • Persistent and Chronic pain 

  • Psychosocial approaches to patient care

  • Blood Flow Restriction Training

  • General Orthopedics

  • Geriatrics 

  • Otago Exercise Program: Falls Prevention Certified

  • PWR! Parkinson Wellness Recovery Certified

Alexis was raised in Sandpoint, Idaho where she graduated from Sandpoint High School in 2016. After high school she obtained her bachelor’s degree in Exercise Science and Health at the University of Idaho. While there, she developed a passion for injury rehabilitation and physical therapy. In order to pursue this passion of improving the health and wellbeing of others, Alexis decided to attend George Fox University where she eventually received her Doctor of Physical Therapy degree in 2023. Prior to graduating, she went on a two-week medical service trip to Uganda, Africa where she provided pediatric and orthopedic physical therapy services to boarding schools, remote villages, and various medical facilities.
Alexis strives to use a multifactorial holistic bio-psycho-social treatment approach that involves combining manual therapy with active treatment to get individuals back to doing the things they love most. She values patient autonomy, education, and self-efficacy to provide individualized, one-on-one care. 
Alexis currently lives in Coeur D’ Alene, Idaho. Outside of the clinic, she enjoys spending time with her friends and family as well as watching and playing all different types of sports. Golfing, skiing, paddleboarding, and hiking are some of her favorites.
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Tristan Phillips, PTA



  • Orthopedics/Sports Medicine

  • Aquatic Physical Therapy

  • Acute/Chronic Pain

  • Manual Therapy

From an early age Tristan has been all about growth and giving a hand up to those in need. His passion for physical therapy began with his first massage business as a kid, Hands O’ Magic. What started off as something for family and friends, continued to grow as he educated himself and acquired skills to expand the population of people he could impact.


Tristan comes from a holistic health background focused on improving the mind-body connection, brain health, and strength conditioning. He is a reiki master and blends his manual therapy skills with his holistic health knowledge to provide custom personalized sessions. He is looking to continue advancing and adding new skills to his toolbox to offer a full body approach for his patients.

Tami J.
Tami Johnson, PTA
  • Orthopedics/Sports Medicine
  • Aquatic Physical Therapy
  • Acute/Chronic Pain
  • Balance/Fall Prevention
Tami graduated from the Loma Linda University School of Allied Health Professions Physical Therapist Assistant program in 1996. Since then, she has been licensed in California, Oregon and Idaho. She has worked in various facilities throughout the West coast beginning her career in outpatient orthopedics and sports medicine for 11 years before moving onto inpatient rehab for 9 years and then home health for the past 5 years. She has now come full circle and returned to her favorite setting of outpatient orthopedics at Cornerstone Physical Therapy and Aquatics.

In her spare time Tami enjoys spending time with family, friends, and pets,
exploring the mountains and lakes of North Idaho, Geocaching, painting pottery and
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Susan Colman, Office Administrator

Susan Colman has been a bicoastal gal her entire life from Northern California to NYC but now resides in the beautiful Selle Valley of Sandpoint.  She started out with a B.A. in Music and then extended her education through the New School’s Creative Arts Therapy program in NYC.


Rooted from a creative background, Susan began exploring the benefits of alternative healing through meditation, yoga, prayer and energy work. She enrolled in the Institute for Integrative Nutrition (NYC) and graduated as a Certified Holistic Health Counselor in 2004.


For over a decade she has guided her clients and friends towards a healthier lifestyle through the implementation of eating “whole foods” and exercise.  Also, being a Reiki Master since 2006, she is a strong believer in combining Eastern and Western medicine as a well-rounded approach to health and wellness.  She has been helping run Physical Therapy and Chiropractic practices since 1997 and is excited to join Cornerstone Physical Therapy once again.

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