Our Staff

Our physicians and staff are here to help meet your child’s medical needs.

Our Physicians & Office Manager

Robert B. Page

M.D., M.A., F.A.A.P.

Dr. Page

Medical Assistants:

  • Tina Taylor, RMA
  • Melina Adams, RN
  • Tammie Brouwer, RN

Dr. Page has been with Trestlewood Pediatrics since 1987. He holds three degrees from Michigan State University (B.S., M.A., M.D.). He completed his internship and residency at the University of Chicago Hospitals and Clinics. Dr. Page's areas of interest include growth and development, diabetes, asthma, and adolescent issues. He and his wife, Mary, have five children and three grand children. His interests outside of work include spending time at his cottage on Chrystal Lake, family activities and MSU athletics.

Stephanie Somers

M.D., F.A.A.P.

Dr. Somers

Medical Assistants:

  • Heather Lockwood, MA

Dr. Somers joined Trestlewood Pediatrics in 1997. A native of East Lansing, Michigan, Dr. Somers received her Bachelor of Arts degree from DePauw University. She served as a Peace Corps Volunteer in Honduras, Central America. She graduated from Michigan State University College of Human Medicine. She completed her Pediatric Residency at the University of Wisconsin and then completed an additional year as Chief Resident in Pediatrics. Dr. Somers has a special interest and expertise in international foreign adoption.

Anthony J. Van Es

M.D., F.A.A.P.

Dr. Van Es

Medical Assistants:

  • Sherrie Millward, MA

Dr. Van Es grew up in South Bend, Indiana and graduated from the university of Notre Dame. He attended Indiana University School of Medicine and completed his pediatric residency at Indiana University Medical Center in Indianapolis. He is board certified in pediatrics and is a fellow of the American Academy of Pediatrics. He joined Trestlewood Pediatrics in 2000. He enjoys reading, photography, running, and spending time with family. He lives in Portage with his wife and three daughters.

Rebekah Lampart

D.O., F.A.A.P.

Dr. Lampart

Medical Assistants:

  • Amelia Gibson, MA

A Michigan native, Dr. Lampart completed her undergraduate degree at Grand Valley State University and then received her Medical Degree from Michigan State University, College of Osteopathic Medicine. She joined Trestlewood in 2009 after completing her internship and residency at Sparrow Hospital in Lansing through Michigan State University. Dr. Lampart has a special interest in breastfeeding, discipline techniques, vaccines, and caring for multiples. Dr. Lampart and her husband have five children, including a set of twins.

Kiersten Derby

M.D., M.P.H., F.A.A.P.

Dr. Derby

Medical Assistants:

  • Lisa Gouin, CMA

Dr. Derby grew up in Atlanta, Georgia and completed her undergraduate degree at Brown University. She attended Emory University for medical school and public health school. Lured by the natural beauty of the Pacific Northwest, she then completed her pediatric residency at the University of Washington, and worked for two years prior to moving to Kalamazoo. She joined Trestlewood Pediatrics in September 2018. When not working, Dr. Derby enjoys spending time with her husband and son, hiking and camping, traveling, and vegetarian cooking.

Elvira "Elvie" Marfil


Elvie Marfil

Elvie was born and raised in Manila, Philippines, and graduated with a degree in Bachelor of Science in Management and Finance. She came to the United States in 1978, and resided in California, Michigan, Oregon, and back to Michigan. Elvie has 38 years of medical experience in management, billing and collection. As an active member of The Lions Clubs International, Elvie received the highest honor a Lion can achieve. In 1987, Elvie was honored as one of the women in business during the National Business Women's Week in the State of Michigan.

Clinical Staff

Melina Adams,

  • Registered Nurse
  • Assisting Robert Page, M.D.
  • Care Management
  • Joined the practice in January 2019

Tammie Brouwer,

  • Registered Nurse
  • Assisting Robert Page, M.D.
  • Care Management
  • Joined the practice in December 2018

Tina Taylor,

  • Registered Medical Assistant
  • Assisting Robert Page, M.D., and Tuesday Phone Nurse
  • Joined the practice in August 1991

Amelia Gibson,

  • Medical Assistant
  • Assisting Rebekah Lampart, DO, and Robert B. Page, M.D.
  • Joined the practice in February 2017

Lisa Gouin,

  • Certified Medical Assistant
  • Referral Specialist
  • Assisting Kiersten Derby, M.D.
  • Joined the practice in September 2011

Heather Lockwood,

  • Medical Assistant
  • Assisting Stephanie Somers, M.D.
  • Joined the practice in April 2014

Sherrie Millward,

  • Medical Assistant
  • Assisting Anthony VanEs, M.D.
  • Joined the practice in June 2011

Front Desk Staff

Kasey Peppler

  • Receptionist
  • Lead Receptionist and Medical Records
  • Joined the practice in September 2012

Amanda Commissaris

  • Receptionist
  • Check in Receptionist
  • Joined the practice in January 2016

Savanah Wilkins

  • Receptionist
  • Check in Receptionist
  • Joined the practice in September 2017

Kayla Quisenberry

  • Receptionist
  • Check in Receptionist
  • Joined the practice in June 2018

Billing Staff

Elvira “Elvie” Marfil

  • Office Manager
  • Management, billing and collection
  • Joined the practice in June of 2016

Sara Herington

  • Medical Billing Specialist
  • Billing and Collection Representative
  • Joined the practice in August 2007