Our Educators

Dr Brian JenkinsBrian Jenkins, MD, is the Founder and President of Doctors In Training.  A native Texan, he earned his BS in 1998 at the University of Texas at Austin and his MD in 2003 at The University of Texas Medical Branch at Galveston.   Dr Jenkins recognized the need for better study materials as a medical student and began developing a novel set of high-yield notes for medical students in 2000. Those notes developed into a Step 1 review course that began in 2002 with a class of 30 students.  The DIT Step 1 and Step 2 reviews are now global courses helping medical students in over 150 U.S. and 50 foreign medical schools.  Drawing from his own experiences as a medical student, resident, and practicing physician, he now works with the DIT team to develop DIT in new directions to continue to provide the highest-quality medical education resources. Dr Jenkins enjoys spending time with family, gardening, reading, and playing sports.


Michael McInnis, MD, is a physician educator at Doctors In Training. He studied chemistry as an undergraduate at Southern Methodist University in Dallas, and attended medical school at the University of Texas in Houston. He has over seven years of experience as a general internist in Arlington, Texas, specializing in the management of chronic disease, including diabetes, hypertension, hyperlipidemia, and obesity.  He is married, and has 3 young children (all boys).  His interests include music (trombone, guitar, writing/arranging, and record-collecting), backpacking, cooking, and reading biographies. 

Chris Lewis, MDChris Lewis, MD, is a physician educator at Doctors In Training.  He attained his medical doctorate at the University of Texas Medical Branch in Galveston, TX.  Today he maintains a busy Family Medicine practice in Round Rock, Texas.  He also enjoys cooking exotic gourmet food, video gaming and playing with his four above average children.  Dr. Lewis strives to infuse his lecturing with humor and excels at telling bad jokes.

Jennifer Shufford, MDJennifer Shuford, MD, is a guest educator at Doctors In Training.  She attended University of Texas Southwestern Medical School.  She completed her fellowship in Infectious Diseases at the Mayo Clinic and received her Master of Public Health degree from Harvard School of Public Health.  She is currently practicing infectious diseases in Austin, Texas, enjoying the year-round warm weather.  A few of her favorite things include: her husband Clark, her two beautiful kids, running, reading mystery books, and playing the string bass.

Dr Katey CarmicalKatelyn Carmical, MD, is a physician educator at Doctors In Training.  She grew up raising cattle on a farm in DeSoto, Missouri and then completed the combined BA/MD program at the University of Missouri- Kansas City.  She completed the Family Medicine Residency Program at John Peter Smith Hospital in Fort Worth, Texas with an emphasis on rural, broad scope medicine.  She is currently working as an independent contractor in emergency rooms and on inpatient services where she enjoys the constant variety.  In her free time she enjoys many adventures with one of our other physician educators, her husband, Dr. Jim Carmical.  She also enjoys cooking, basketball, spending time outdoors, and crafting. 

Jim Carmical photoJim Carmical MD,  is a physician educator at Doctors In Training. After Majoring in Biology at Mississippi State University, he moved back to Arkansas to go to medical school. He always wanted to go back to serve the rural community and sought through a family medicine program to complete his training. He is currently at John Peter Smith in Fort Worth, the largest and one of the best FM programs in the country.  While there he discovered an enjoyment of teaching up and coming students in medical fields and has sought ways to incorporate that in his career.  He completed three years there and has been working as an independent contractor physician to rural hospitals as an ED physician and Hospitalist, while waiting on his wife to complete her training. He met his wife at JPS, both being small town people with an interest in the rural areas, and knowing that rural docs needed to be able to handle a wide variety of problems on their own. His wife will be finishing her training and they plan on enjoying the freedom of post residency life with a little travel and outdoor life.

Mary Beth Cox photoMary Beth Cox, MD, is a guest educator at Doctors In Training. She earned her bachelor’s degrees in Genetics and Biochemistry from Texas A&M University and her MD at the University of Texas in Houston. She then moved to North Carolina for an Internal Medicine residency, followed by an Endocrinology fellowship and a Masters in Health Sciences at Duke University Medical Center. She moved to Fort Worth in 2010 and began practice as a general endocrinologist. Then in 2015, she focused her clinical work on just diabetes and added a busy job in research and development. In her free time, she enjoys her family and dogs, running, eating good food, and being outside.

Dr E TajzoyEmil Tajzoy, MD, is a guest educator at Doctors In Training. A native Dallasite, he studied biology and film at Southern Methodist University. He stayed in town for medical school at UT Southwestern, and completed his OB/GYN residency at Parkland Hospital.  He then traveled 10 miles north to Presbyterian Hospital of Dallas for the Advanced Gynecologic Surgery fellowship. He has since joined a private practice in the area. He enjoys conducting a lecture series for soon to be new dads at Presbyterian. In his spare time, he likes playing tennis, attending plays and watching movies with his wife, Catherine, and hanging out with his cat Chappy.

Dr Cherilyn CecchiniCherilyn Cecchini, MD, is a guest educator at Doctors in Training. She studied biology and psychology at The Pennsylvania State University and attended medical school at Sidney Kimmel Medical College (formerly Jefferson Medical College) in Philadelphia, PA. She completed general pediatric residency at Children's National Medical Center in Washington, DC. She is a board certified pediatrician located in New York, New York. In her free time, she enjoys athletics, reading and socializing with friends and family.

Sana ZekriSana Zekri, MD, is a guest educator a Doctors In Training. He graduated from the University of Texas at Dallas in 2011, magna cum laude, with a Bachelor’s of Science in Biochemistry. He went on to get his medical degree at the Baylor College of Medicine. He is currently a Family Medicine resident at the John Peter Smith Hospital System where he is in the Maternal-Child Health Fellowship. He is also concurrently pursuing a Master’s in Public Health at the University of North Texas Health Science Center. His interests include medical education, women’s health, and the contribution of medicine to the advancement of justice. He also enjoys running and rock climbing. He apologizes for the glare off of his bald, shiny head when he lectures.

Thomas Van DinterThomas Van Dinter, MD, is a guest educator at Doctors In Training. He studied biology and spanish at the University of North Texas and then attended medical school at the University of Texas Medical Branch in Galveston.  He practices gastroenterology in the North Dallas area and is involved in medical education.  His clinical interests include general gastroenterology, liver disease and pancreaticobiliary disorders. In his free time, he enjoys cycling, sports and spending time with his family.

DrfinkleaDavid Finklea, MD, is a physician educator at Doctors In Training. He earned his Bachelor of Science in 1999 at Centenary College in Shreveport, Louisiana. He attained his medical doctorate in 2004 from the University of Texas Medical Branch in Galveston. He practices pulmonary critical care medicine in an academic hospital in the DFW area.  His clinical interests include Pulmonology; specifically cystic fibrosis, general pulmonology, critical care medicine, transplantation and end of life care. In his free time, he enjoys baseball and attending church.

James_SarSarah James, DO, FACOFP, is a guest educator at Doctors In Training. She earned her BS in Biochemistry with department honors from Beloit College, Beloit, WI; DO, Des Moines University, Des Moines, IA; osteopathic family medicine residency, Columbia St Marys, Milwaukee, WI; Neuromusculoskeletal Medicine residency, University of North Texas Health Science Center. Dr James is currently the Director of Osteopathic Education for the University of Wisconsin family medicine residencies and the chair of the Wisconsin Statewide Osteopathic Collaborative. She enjoys running, painting acrylic of canvas, and improving osteopathic education.