Program Leadership

Ted Christou, MD

Program Director

Welcome to the South Side. Born and raised in Chicago and x-chief resident at Mercy I’ve been here for a while. I manage the outpatient continuity clinic and will also help you learn about the business and clerical side of medicine. You can check out ambulatory care and resident rounding information at, or see a few of the places I’ve worked in field medicine at One of the YouTube presentations has almost 20 hits!


I enjoy lake front or prairie path bike rides and have been known to invite the residents to my home in Oak Park for beverages, bags, and BBQ in late Summer. Welcome!


Arely (“Lily”) Ventura

Internal Medicine Residency Coordinator

Welcome to Mercy Hospital, I am the Internal Medicine Coordinator. I am here to assist you during your residency training.

A few things about me, I Grew up in Chicago, love walking with my dog and I am a Cubs fan.

John Yoon, MD

Associate Program Director

Welcome to Mercy! Our program is eagerly looking forward to meeting all of you. To introduce myself, I am an academic hospitalist and part of the Core Faculty here at Mercy. I also work at the University of Chicago as a clinical ethicist and faculty scholar for the Program on Medicine and Religion. My interests are studying moral and professional development in medical education, and the role of religion/spirituality in shaping professional identity. I also hope to work with many of you on developing your scholarly activity at some point during your residency training.


As for hobbies, I spend most of my free time reading books, playing with my five kids, exercising on the tennis courts, and working with my church community in developing a non-profit that work towards social justice in globally underserved areas. I grew up in California, went to school there and in Texas, and now I’ve lived in Chicago for the last decade (Bridgeport area), so I may be a neighbor to many of you! Again, I look forward to meeting each of you in person.


Maja Delibasic, MD

Associate Program Director

Welcome to the Mercy Hospital and Internal Medicine Residency Program! I graduated from Medical School in Serbia and moved to the Windy City (which I call home now) for residency at Mercy Hospital. Besides being a core faculty, I am a Site Director for Medical Students in our hospital. As a junior faculty, I enjoy working with residents in Oakwood Shores Clinic as well as being challenged on the general medical floor. I hope residents see me as a young, energetic and efficient attending that is leading them subtly towards the right clinical decisions, leaving them with sufficient autonomy to make independent clinical judgments. Personally, I am interested in cardiology and have been currently doing research projects in heart transplant patients at Rush University. I enjoy vibrant discussions with interesting people, exploring the Chicago as well as random tropical vacations, dancing salsa and reading. I hope you will have an awesome three years here!


Michael Markos, MD

Associate Program Director

Welcome to Mercy Hospital and Medical Center Internal Medicine Residency Program. We wish you success as you start your residency. We are here to provide support during your time of training. I am excited to welcome you as a part of the Mercy Family. A little about me, I was born and raised in the Chicago land area. My interests include Crossfit, obstacle course racing, running and hanging out with my family, I currently practice Pulmonary and Critical Care Medicine and am the Director of the ICU. I completed my undergraduate Bachelors in Science from Loyola University at Chicago, Medical training at St George’s University Grenada West Indies. Internal Medicine Residency training at University of Illinois Advocate Christ Program and Pulmonary and Critical Care Fellowship at University of Illinois at Chicago. I served as both Chief Resident and Chief Fellow. I look forward to meeting you all and working with you.


Rizwana Syed, MD

Core faculty

Welcome to Mercy Hospital Residency program

Hopefully you'll have a great time working and learning at Mercy .

I am also a Mercy graduate worked as a Chief resident and now starting my second year as a teaching attending at Mercy. I originally grew up in Britain and Saudi Arabia and did medical school in Pakistan. Aside from work I love to travel explore new places and read.

I shall have the pleasure of working with all of you during inpatient and outpatient experiences as well, and I hope we can learn and teach each other. I hope that that all the residents find me approachable and I look forward to working with all of you.


Nasser Boshra, MD

Core faculty

Welcome to Mercy! We are happy to see you starting soon and as usual we will be available to help you all to have a smooth start and minimize any inconvenience. I did my residency in Mercy and I did one year as a chief resident, became teaching attending and core faculty. We will work together inpatient and outpatient and will help you pick interesting cases for various kinds of publishing. Do not hesitate to ask for any kind of help as a newcomer we will be glad to help you. As my personal hobbies, I enjoy collecting antiques, art, stamps, coins, Auto enthusiast, repairs or custom. Will definitely help you enjoy your residency in Mercy!


Matthew Cerasale, MD, MPH

Core faculty

Congratulations on matching at Mercy for your Internal Medicine residency. I am looking forward to working with you all over the next 3 years during your inpatient months, as I am a academic hospitalist. In addition to my time at Mercy, I also round at the University of Chicago, where I am the Quality Improvement Director for Hospital Medicine. I enjoy the opportunity share my QI experience with residents and help to support multiple resident-led QI projects. I am a lifelong Midwesterner with undergrad and med school in Indiana, then residency, chief year, and attending in Detroit, and for the last 2 years working here in Chicago. On the weekends, I enjoy running, watching football, and the occasional fishing trip.


Edwin Rosas, MD

Core faculty

I attended Medical School at The National University of Trujillo in Peru and conducted my training in Internal Medicine at St John’s Episcopal Hospital - SUNY Downstate Medical Center in New York City. I was Chief Resident and then served as Assistant Professor at the University of Virginia. My interests are related to curriculum development in clinical reasoning and high-value care. I am currently completing the MERITS Fellowship on Medical Education, and also serve as Clinical Associate for the Section of Hospital Medicine at the University of Chicago.


Travis Yamanaka, MD

Core faculty

Welcome to Mercy Hospital. I am one of the pulmonary and critical care physicians and will be working with all of in a variety of locations including pulmonary clinic, consult service, ICU and to assist with procedures.  I went to medical school at Rush University Medical Center in Chicago and completed my residency at the University of Illinois at Chicago.  I was a chief resident there and then completed a fellowship in pulmonary and critical care there as well.  I have been working at Mercy since July of 2016.  I am particularly interested in US and have critical care ultrasound certification while recently becoming boarded in critical care echocardiography.  I look forward to meeting and working with everyone.  


Rohan Mehta, MD

Chief Resident (fourth-year, 2020-2021)

Hi everyone! Welcome to Mercy! I’ll be one of your chiefs next year. I was born and raised in Central NJ (NOT the Jersey Shore), went to Wake Forest University for undergrad, International American University for medical school and along with Nick, just completed residency here at Mercy. I’m a huge foodie so in my free time I’m generally cooking or exploring local eateries. I’m also a big NY sports fan - Yankees/Giants/Knicks. Medically, my primary interest is in Heme/Onc but I enjoy all aspects of medical education. I look forward to meeting you all and having a great year together!


Nicholas Barreras, MD

Chief Resident (fourth-year, 2020-2021)

Welcome to the Mercy Family.  Born and raised in Fort Lauderdale, Fl, and also have family roots here in the NW suburbs.  Went to FSU for undergrad and UMHS in St. Kitts for medical school.  I just finished residency here at Mercy and am excited to be continuing as your next chief.  My spare time is spent with my fiance (COVID wedding delays) and Frankie, our new pup.  I’ll defer restaurants to Rohan but between us we can answer most questions about the city. My primary interest is in Pulmonary/Critical Care and I look forward to teaching you in the sim lab and on the wards.  

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