Meet the Cornerstone family.
We strive to treat patients like our friends, neighbors and family - because they are!

Mexico Location

Dr. Alex Finck
Born and raised in Mexico, Missouri, I always knew I was going to return to practice medicine and care for the people here. My wife, Loren, is a Mexico native as well, so we both know from experience how wonderful a place Mexico is to live and raise a family. We are excited to finally come home and help care for the community that has always been home to us. Now we are excited to care for our neighbors in Fulton! We love visiting Fulton for its great restaurants and shops and are so excited to become more integrated with its community.
I chose family medicine because I enjoy the variety of care I can offer to my patients. I like getting to know my patients and their families and being “their doctor”. I want to care for all ages and all varieties of common medical conditions.
I chose family medicine because I enjoy the variety of care I can offer to my patients. I like getting to know my patients and their families and being “their doctor”. I want to care for all ages and all varieties of common medical conditions.

Brenda Hull, LPN
I’m originally from Vandalia, MO but have lived and worked here in Mexico for 15 years. I have worked in several capacities as a nurse over my 25 year nursing career, but clinical outpatient nursing has always been my passion. I love working at Cornerstone because it is a small clinic that feels like family – as cliché as that may sound. When I’m not working, I love spending time with my family, boating at Mark Twain Lake, reading and gardening.

Haley Mittag, LPN
I was born and raised in Mexico, MO and have worked in nursing for 7 years now. Outpatient nursing has always been fun, but I have especially enjoyed working at Cornerstone because of its small, family-oriented nature. It’s great knowing all the faces that come through our doors. When not in the office, I enjoy fitness in my home gym, boating, and hanging with family and friends.

Sandie Walker, Receptionist
I moved to Mexico, MO in 1991. I have worked several positions as a receptionist. Working for Cornerstone has been great. It's a small practice, but busy! It's great knowing many patients that come in. When not working, I love going to our cabin at Mark Twain Lake and spending time with family and friends.
Fulton Location

Kelsey Tillman, APRN
I'm a nurse practitioner with 13 years of nursing experience, primarily in the hospital and emergency room setting. I've chosen primary care because I enjoy developing the relationships and health outcomes that progress over time.
My family recently moved to the area from southeast Missouri. I'm excited to be a part of Cornerstone in Fulton and foster connections with both patients and the community. I'm passionate about helping people create a healthier life that allows them to pursue their goals. Outside of work, I keep busy with my two daughters, being active outside, reading, and woodworking.
My family recently moved to the area from southeast Missouri. I'm excited to be a part of Cornerstone in Fulton and foster connections with both patients and the community. I'm passionate about helping people create a healthier life that allows them to pursue their goals. Outside of work, I keep busy with my two daughters, being active outside, reading, and woodworking.