Our Residents


Kenneth Visalli, DO

Chief Resident

Dr. Visalli is from Utica, NY. He completed his undergraduate degree at Utica College of Syracuse University in Biology with minors in Business Management and Chemistry. During his undergraduate years he worked as the Head Chef at a local Restaurant and played the drums in a local rock band. After college he went on to complete his Doctor of Osteopathic Medicine and Master of Public Health Degrees at The University of New England in Biddeford, ME. His academic interests include Inflammatory Bowel Disease, Cancer prevention and health policy. In his free time Dr. Visalli enjoys spending time with his family, cooking, playing the drums, participating in sporting events and learning about anything new. 

Darren Adderly, MD

Resident Physician


Joao Fontoura, MD

Resident Physician

I completed my undergraduate degree in biology at  Brigham Young University and my medical degree at Florida International University. I am very interested in working with underserved populations and global health. When not working in the medical field, I spend most of my time with my wife and kids.

Martin Guerrero, MD

Resident Physician

I was born in Managua, Nicaragua, and at the age of 8 moved to Florida with my family. I lived in Miami through high school, and after went on to complete my undergraduate studies in philosophy at the University of Florida in Gainesville, Fl. I then went on to receive a masters in nutrition from Columbia University in NYC and received my MD degree from Jefferson Medical College in Philadelphia, PA. After several years of being away, I have to admit that I am very excited and happy to be back home in sunny Florida! I am looking forward to making Tampa my new home for the next 4 years, getting to know and becoming familiar with the area, and making new friends and family along the way.

Asef Mahmud, MD

Resident Physician

I was born in Dhaka, Bangledesh half-way around the world not too long ago. I moved to Montreal, Canada when I was 2 years old and spent 6 years there until my family moved to Tampa, Florida when I was 8. We eventually settled in Orlando, Florida where I finished middle school and high school. I then came back to Tampa to do college, medical school and now finally my residency in Med-Peds. I am not shy to admit that I'm a pretty big geek and will engage with anyone in talk of movies, tv shows or games. Also, I love to draw and always imagined I would be an animator if this doctoring thing didn't work out (fortunately it has so far). My academic interests include education and technology. I specialized in Medical Education during my years in medical school and I hope to continue teaching in the future when I'm finally done training. I also hope to use my training to engage in research and development of new, cheap and easily accessible technologies to help advance healthcare in underserved areas especially if I chose to pursue a fellowship in a sub-specialty with research opportunities. Here's hoping to another 4 years of fun and adventure in the awesome Florida sun.


Jenna Simpson, DO

Resident Physician

I am originally from the San Francisco Bay Area.  I completed my undergraduate training at San Diego State University in Biology and Spanish.  From there I moved to Phoenix, Arizona to complete my medical school training at Midwestern University.  I absolutely loved living there as hiking is one of my favorite activities.  After living in the desert for four years, I missed the beach, so Tampa was an easy choice for residency.  The beaches are beautiful and the water is warm!


Alison Burt, MD

Resident Physician

A true Tampa native, I received both my undergraduate and medical degree from University of South Florida. I am thrilled to be staying to complete my Med-Peds training! I chose Med-Peds because I wanted to be able to do it all. My medical interests include infectious disease, critical care, and global health. I love to travel and I try to make it over to visit family in The Bahamas every chance I get. In my free time, I like to read, cook, tend to my orchids, and spend time with friends and family.

Jasmine Young, MD

Resident Physician

I was born in New Jersey and lived in New York for a couple years after. The allure of not shoveling snow and beautiful beaches called my family down to sunny Orlando, Florida. For my undergrad, I attended Florida International University in Miami and moved on to attend medical school at USF. Growing up in Florida, I must admit I am a huge fan of Disney, long walks on the beach, and any water-related activities in general. I am so excited and thrilled to have matched at USF. In addition to being in close vicinity to the above, the residents and attendings are phenomenal physicians, mentors, and friends. Personally, I am interested in Global Health and academia. For fun, I love to do anything outdoors, indulge in being a foodie, and settling down with a great book.

Chris Richardson, DO

Resident Physician

As a native of North Carolina I started my college career (as a pirate!) at East Carolina University majoring in Biology, Neuroscience, and Psychology with a minor in Chemistry.  After that I made my way up to Hokie land in Blacksburg, VA, where I completed medical school at The Edward Via Virginia College of Osteopathic Medicine. I knew USF was the place for me as soon as I found out about Gasparilla. What is Gasparilla, you ask?  It’s only a month-long festival in Tampa centered around a pirate invasion!  Yes, count me in.  Turns out I am a true pirate at heart after all.  In addition to pirate shenanigans, there was much more that drew me to USF- a large part being the genuine residents and faculty, although the continuously warm weather and beautiful beaches don't hurt either.  After residency I plan to fulfill my National Health Service Corps commitment by working with underserved populations in primary care. After that, who knows?  The world is my oyster and I know the USF Med-Peds program will prepare me for whatever direction I choose to take.

Bryce Somer, MD

Resident Physician

Dr. Somer grew up in Yankton, SD. He obtained his undergraduate degree in Nutrition, Exercise, and Health Science from the University of Nebraska-Lincoln (Go Big Red!) and went on to get his MD from the University of Nebraska College of Medicine. He was very excited to start his residency at USF along with his wife, Dr. Sarah (Holdt) Somer, who matched with him at USF in the OB-Gyn Department. His medical interests include preventive medicine. In his spare time, his hobbies include running, baseball/softball and other sports, and spending quality time with Sarah and their dog Cadie.

Drew Meriweather, MD

Resident Physician

Drew, a native of Mobile, Alabama who grew up in Virginia, attended the University of Southern Mississippi for his Bachelor’s in Biological Sciences; during that time, he wrote an honors thesis for his work with a novel human homolog in Drosophila melanogaster implicated in regulating the developmental cascades of multiple organ systems. An avid lover of music, he served in multiple Southern Miss bands, including the Pride of Mississippi Marching Band (where he served as the saxophone section leader), jazz ensembles, and concert Bands.  He attended medical school at the University of South Alabama. His medical interests are broad, and he hopes to practice clinical and hospital medicine in a socioeconomically diverse community. Drew enjoys being active and has coached many sports teams, including baseball for physically and mentally challenged children and youth soccer teams. His free time is spent with his wonderful family and friends, grilling outdoors, playing sports, running, practicing music, and collecting old vinyls.


Matthew Baron, MD

Resident Physician

I was born and raised in rural Massachusetts and completed my undergraduate degree at Williams College with a major in chemistry. Following graduation, I volunteered with the U.S. Peace Corps as a primary school science teacher in El Salvador, gaining a fluency in Spanish and a love of the tropics. I went on to recieve my meidcal degree from the University of Massachussetts. In my freetime, I enjoy sports, outdoor activities including fishing and scuba diving, and weekend adventures.

Danielle Jordan, MD

Resident Physician

A North Carolina native, Dr. Jordan graduated from Davidson College with a major in Biology. During her undergraduate years, she learned to speak Spanish by living and studying abroad in Barcelona, Peru, and Costa Rica. She returned to her home town of Chapel Hill to work at the University of North Carolina as the clinical research coordinator for lupus studies. She attended the Brody School of Medicine at ECU and was involved in various community outreach programs in the underserved areas of Eastern North Carolina. During medical school, she traveled to Haiti and Nicaragua as part of medical volunteer trips. Academic interests include adolescent medicine, childhood obesity, and issues in public health. In her spare time, you can find her at the beach, playing with her dog Sookie, running, playing volleyball/soccer, listening to live music and eating sushi.

Colleen Maier, DO

Resident Physician

I was born and raised in Baltimore, MD. For my undergrad, I left the city life for the beach at Salisbury University in Salisbury, MD where I majored in Biology and Spanish. Between college and medical school, I dabbled in research in Bethesda, MD. I traveled north to Philadelphia for medical school at Philadelphia College of Osteopathic Medicine. After many harsh winters in the north, I am excited to start residency at USF! I chose med/peds because I am interested in Global Health or transitional care. As a true Maryland girl, my loves are crabcakes, football and baseball games (O’s and Yanks). In my free time, I also enjoy watching movies and dancing salsa. Go Ravens!

Stephen Mayper, MD

Resident Physician

A Florida native, born and raised (with the exception of a three-year adventure in Nashville). In Gainesville, I met my beautiful wife and earned a Bachelor's degree in Microbiology (in order of occurrence and importance). We then came to Tampa, where I earned my Doctor of Medicine degree at the USF Morsani College of Medicine. We are elated to be staying in Tampa, and to continue serving this vibrant and diverse community, through both our personal and professional lives. Professionally, my interests lie in primary care, transitional care, and working with vulnerable populations. Between workdays, you can usually find me spending time with my family, trying to keep up with my eclectic and ever-expanding reading list, or trying new restaurants and food festivals.

Michelle Rosario, MD

Resident Physician

After moving around a bit, I grew up mostly in Tampa - Tampa has so much to offer- amazing restaurants, a close proximity to beautiful beaches and great attractions, and frequent fun events. I earned my bachelor’s in Biology at the University of Miami but decided to return home to USF for medical school. After getting to know the USF Health community (especially those in the Med-Peds family) and the patient population, I knew that I wanted to stay for residency. My medical interests include caring for underserved populations, GI, ID, and medical education. I am excited for the next four years and know that whatever I decide for my future, USF will prepare me well!

Megan Spiewak, MD

Resident Physician

I grew up in the hills of western TN and moved to Tampa in high school.  I graduated with a degree in biology from Florida Gulf Coast University (go Eagles!!!!!) and attended medical school at USF Morsani College of Medicine.  I adore living in Florida and consider myself a true Floridian.  My passion in medicine is education and my goal is to continue teaching clinically at USF during and after residency.   I am the mother of a spunky toddler and two crazy dogs.  I spend all of my free time at home with my family.  My favorite pastime is hot summer days by the pool with friends, family, and good BBQ.