Meet the Staff


Dr. Derek Peek

Derek T. Peek DDS, MS

Dr. Peek is a board-certified endodontist with highly specialized training in root canal anatomy and microsurgical procedures. He was born in Oklahoma City, Oklahoma, and attended Heritage Hall School. He was a state champion in both football and baseball earning him a selection onto the 1999 Oklahoma All-State Football team. He attended SMU in Dallas, Texas, but then transferred and graduated from Wheaton College in Wheaton, Illinois.


Before entering dental school, Dr. Peek was a 7th grade science teacher and coach where he encouraged middle school kids to excel both on and off the field.


Dr. Peek graduated from the University of Oklahoma College of Dentistry. He then entered his endodontic residency at the LSU School of Dentistry where he received both his Endodontic Certificate and a Master of Science degree. He is an active and current member of the following organizations: American Board of Endodontics (ABE), American Association of Endodontics (AAE), American Dental Association (ADA), Iowa Dental Association (IDA), and the Linn County Dental Society. Dr. Peek is also on staff at St. Luke’s Hospital where he can be called upon for consults in the emergency room.


Outside of dentistry, Dr. Peek is an avid cyclist and can be found pedaling around enjoying the Eastern Iowa country side. He enjoys life, his daily 5:30am Crossfit class, and his ability to help others receive the dental care they deserve.

Thomas L. Peek DDS, MS

Dr. Peek has been an endodontic specialist for over 40 years attaining substantial knowledge and expertise in the field. He was born in Sioux City, Iowa. He attended college at Oklahoma State University where he was an all fraternity wrestling champion in 1971. He then attended the University of Iowa College of Dentistry where he was an exchange student in Sweden his senior year. Before graduating, he was accepted into the Endodontic program at Iowa and received his Endodontic Certificate and Master of Science degree.


Dr. Peek has lived and practiced Endodontics in Cedar Rapids, his adopted home town, the last 12 years. He is an adjunct faculty member of the department of family dentistry at the College of Dentistry.


Dr. Peek is the Past President of the IDA — Iowa Dental Association. As President he encouraged the improvement in the health of the public, promoted the art and science of dentistry, and represented the dental interests of dentists with the public they serve.


In his spare time, he loves to bike, play golf, and enjoy the outdoors with his wife, Judy, and their yellow lab, Moocher.


He cherishes working with his son every day, but is also proud of his daughter, Elizabeth Worsham MD, who is a psychiatrist in Jacksonville, Florida.

Front Office

Jennifer Jacobus – Office Manager

Jen comes to us with over 12 years of experience in the medical field. We are thrilled she has crossed over and enhanced our dental family.


Jen has three boys: Tyler, Gage, and Davin. In her spare time she enjoys running, spending time outdoors with her chocolate lab Stella, and watching her son play hockey as he is a part of the CR Jr. Roughriders and the Iowa Panthers AAA teams.

Jennifer Jacobus

Corrie Richer

Corrie joins us with over 6 years in the medical field; most recently from a pediatric dental office. She is enthusiastic and has grown to enjoy the endodontic specialty. We are excited to have her as a part of the Eastern Iowa Endodontic team.


Corrie enjoys spending time with her fiancée, Holden, and their two dogs: Baylor and Mya. Corrie is an avid Hawkeye fan and never misses a game. She also loves reading books, being creative, and spending time with her friends and family as much as possible.

Corrie Richer


Tessa Lohr – Dental Assistant

Tessa joins us after completing the Dental Assisting Program at Kirkwood Community College. Through her student rotations, she discovered her love for Endodontics. Tessa graduated from Kirkwood Community College with her AAS and her Dental Assisting Certificate, RDA.


Tessa enjoys spending time with her husband, Ken. Tessa is a devoted Dallas Cowboys fan. She also loves photography, reading, traveling, and helping out her parents with their Bed and Breakfast.

Tessa Lohr

Amanda Westby – Dental Assistant

Amanda graduated from Kirkwood Community College with her AAS and her Dental Assisting Certificate, RDA. After completing several rotations with different specialties, Amanda realized her love for endodontics and we are thrilled she is a part of our team!


Amanda has made Cedar Rapids her home for the last 2 years after living in Keokuk her entire life. She enjoys traveling to new places with her friends, attending concerts, and spending time with her dog, Nala. Amanda is also an energetic Hawkeye’s fan and enjoys attending home games in Iowa City. Go Hawks!!

Amanda Westby

HonorBright Moocher – Canine Assistant

Moocher is the office dog for Eastern Iowa Endodontics. Moocher is a 1 year old yellow lab born in Dewitt, Iowa and raised in Cedar Rapids.


He has passed the AKC puppy obedience course and is working on the AKC Good Citizen certificate.


Moocher loves to take long walks with his humans.  He is very good at catching and fetching his Frisbee. He is equally competent with his tennis balls.


At Eastern Iowa Endodontics, Moocher hangs out in his office and keeps track of all his toys. At Lunch, he likes to snack on peanut butter from one of his Kongs.


Nicknamed “Mr. Happy”, Moocher is always happy and makes everyone around him happy too!!