Our Team



Luis Aparicio, M.D., F.A.C.E., C.C.D.

Adult and Pediatric Endocrinology

28 Years

  • F.A.C.E: American Association of Clinical Endocrinology 

  • Board Certified Pediatric Endocrinologist - Specializing in Metabolism

  • Practicing at Metabolic Disease since 1992

  • Vitals.com 2010 Compassionate Doctor Award

  • National University of San Marcos - Doctor of Medicine

  • Rush University- Internship & Residency Pediatrics

  • Brown University - Fellowship. Pediatric Endocrinology

Jaime Steinsapir, M.D., PhD

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First Year

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Morgan Holmes, D.P.M.



3 Years

  • Veterans Administration Allan Park- Residency Podiatrist Surgery

  • John D Dingell VA Med Center- Residency Podiatrist Surgery

John "Jack" Cartwright, PA-C

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Physician Assistant

First Year!

Jack joined Metabolic Disease Associates in 2019 after receiving his Master’s degree from Lock Haven University’s PA program. He grew up in Chicago, but has lots of family in Pennsylvania. He did a rotation with Metabolic Disease Associates as a graduate student, and enjoyed it so much he decided to join us full time. Before becoming a PA, Jack worked in market research and consulting for the Nielsen Company. A passion for nutrition and metabolic health research, and a desire to help people lead healthier lives eventually drove him to change career paths. He enjoys skiing, reading, hiking, bikerides, and spending time on Presque Isle during the summer months.

Cory Davidson, PA-C


Physician Assistant

12 Years

Cory Davidson graduated from Gannon University with Master's of Physician Assistant.  He has been with Metabolic Disease Associates since 2008. He also completed the AACE course for UGFNA in 2011. His hobbies include spending time with family, fishing, and travel.

Megan Dougan, PA-C

Physician Assistant

12 Years


Maureen Grady


Physician Assistant

First Year!

I graduated from Gannon University with my MPAS in 2019. I am originally from Illinois, but greatly enjoy my new home in Erie. I enjoy cooking, yoga, and spending time with friends and family.

Erin Herhold, PA-C


Physician Assistant

2 Years


Maureen Schuller, PA-C

Physician Assistant

3 Years

Maureen has been a member of the Metabolic Disease Associates team since 2017. She graduated with a Master of Science in Physician Assistant Studies from Salus University in 2014. She is also a licensed Athletic Trainer, receiving her bachelor degree from Slippery Rock University. She is from McKean, PA and resides with her husband and two children. In addition to spending time with her family, she enjoys camping, hiking, and running.

Katelyn Reisenauer, PA-C


Physician Assistant

2 Years

Katelyn is a 2018 graduate of Lock Haven University's PA program. She was selected as a member of Pi Alpha, the National Honor Society of PAs for her academic excellence and community service involvement. She is from Cambridge Springs and enjoys hiking, reading, and The Office.

Shana Davidson, PA-C

Physician Assistant

17 Years

An Erie native, Shay Davidson is a 2003 graduate of the Master's of Physician Assistant Science program at Gannon University. She has been employed at Metabolic Disease Associates since 2003. She enjoys working with the adult and pediatric populations. She earned her Certificate in Diabetes Education License in 2005 and is knowledgeable on all insulin pumps, continuous glucose monitoring systems, and new technology in diabetes management. In addition to spending time with her family, she enjoys running and yoga.


Felipe Aparicio

Practice Manager

34 Years

I enjoy hot wings and a cool breeze.



Front Desk



3 Years

I am an Erie native. I have worked in the medical field for 13 yrs. I live with my boyfriend and daughter. In my free time I like to spend time with my family and friends. Some of my favorite things I enjoy are the beach, working in my flower garden, decorating my house, taking care of my pets, and shopping.



First Year!

I've been working in the medical field for almost a decade. This is my first year at Metabolic Associates. I spend my time outside of work with my husband, son, nephew, and 2 dogs. We enjoy camping and the outdoors.



3 Years

I enjoy cooking, music, movies, summer time, arts and crafts, and my two cats.



First Year!

My favorite hobby is showing pictures of my dogs to people, especially when they don't ask.




Lab Manager

12 Years

I am an Erie native. I have been a phlebotomist (vampire) for 20 years, became Metabolic 's lab supervisor beginning of this year and I am currently on my last year and a half of school to become a Crisis Intake Counselor.




First Year!





Medical Assistant

3 Years

I attended Great Lakes Institute for Medical Assistants. I enjoy spending time with family, movies, and going to the beach.




Stephanie, RT, (R) (CDT)

DEXA Technician

CoolSculpting Technician

16 Years

Erie area native; graduate of Radiologic Science program at Gannon Universtiy. I enjoy spending time with my husband, our two daughters and two dogs and friends and family. I spend most of my free time cooking for those I love!



Ultrasound Technician

2 Years

I am from Cambridge Springs, PA. I graduated from Great Lakes Institute of Technology in 2013 and am registered in Abdomen and small parts. I enjoy Kayaking and spending time with family and friends!


Erie Diabetes Institute


Renee Caryl, RD,LDN, CDE

Registered Dietician

Certified Diabetes Educator

9 Years

Holds a certificate of training in both Adult Weight Management and Child and Adolescent Weight Management from the Academy of Nutrition and Dietetics Commission on Dietetic Registration.


Billing and Insurance



Medical Assistant/Billing

11 Years

I graduated from Tri State Business institute in 2009 and have been at MDA ever since.