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Current and Former Fellows

Complete list of Adminstrative Fellowship Alumni → 



Christopher M. O’Connor, FACHE
Chief Executive Officer & President
Yale New Haven Health

Christopher M. O’Connor is Chief Executive Officer & President of Yale New Haven Health System (YNHHS), the largest and most comprehensive healthcare system in Connecticut and recognized nationally for advanced clinical care. Prior to his role as CEO, Mr. O’Connor first served as Executive Vice President and Chief Operating Officer when he joined the Yale New Haven Health System in 2012. He was appointed President of YNHHS in 2020, where he was responsible for the operations of the System.

Mr. O’Connor previously served as President and CEO of the Saint Raphael Healthcare System and the Hospital of Saint Raphael, serving in that position until the successful affiliation with Yale New Haven Hospital, September, 2012. Previous roles included serving as President of Caritas St. Elizabeth Medical Center, the 340-bed flagship of the six-hospital system affiliated with the Archdiocese of Boston and Tufts School of Medicine, and as Vice President of Clinical Operations for the Ochsner Health System in New Orleans.

Mr. O’Connor is a member of a number of boards, including serving as chair of the Connecticut Hospital Association (CHA). He is a Fellow of the American College of Healthcare Executives (ACHE). Mr. O’Connor received his Masters in Health Services Administration from George Washington University in 1996 and his Bachelor of Arts, Economics from George Washington University in 1993.


Current and Former Fellows


Sue Tenorio Céspedes, MBBS, BSMLS, MHA
Administrative Fellow
Yale New Haven Health
[email protected]
Sue Tenorio Céspedes was born in Tehuacan, Mexico. At age 15, she moved to Ireland to attend St. Louis High School in Dublin. She returned to Mexico and earned a Bachelor of Medicine, Bachelor of Surgery from the University of Puebla. After moving to the United States, she earned a Bachelor of Science in Medical Laboratory Science from the University of Bridgeport and a Master of Healthcare Administration from New York University. She also earned a Lean Six Sigma Green Belt for Healthcare Certificate from Emory University and an Executive and Leadership Development Certificate from Wharton Executive Education. 
Tenorio Céspedes has held various clinical and academic roles as a physician, teacher and medical laboratory scientist. While completing her MHA, she worked full-time as the lead medical microbiology laboratory scientist and advanced medical laboratory scientist in hematology and clinical chemistry at Norwalk Hospital. During that time, Tenorio Céspedes served as a Quality and Safety Committee member and a peer inspector for the College of American Pathologists in New York City. She also worked closely with the Connecticut Department of Public Health, implementing new molecular testing and responding to the COVID-19 pandemic and the 2022 mpox outbreak. 
Outside of her professional role, she enjoys spending time with her husband and three children, cooking, reading and going to the beach.

Chandler Wilson, MHA 
Administrative Fellow
Yale New Haven Health
[email protected]
Chandler Wilson is a native of Pine Bluff, Arkansas. She earned a Bachelor of Science in Biology from the University of Arkansas at Pine Bluff and a Master of Health Administration from the University of Arkansas for Medical Sciences.
Chandler worked full-time as an Anesthesia Tech Supervisor in Perioperative Services during graduate school at the University of Arkansas for Medical Sciences (UAMS). As a supervisor, she doubled the staffing matrix while maintaining employee engagement. Additionally, Chandler worked on interdepartmental projects to better support patient outcomes. She also volunteered as a recruiter for the UAMS Master of Health Administration Program. Chandler is a member of the Delta Omega Honor Society and the Upsilon Phi Delta Honor Society. 
Outside her professional role, she enjoys spending time with her family and dog, Mason, traveling and singing.

logan sangree-hills 
Logan Sangree-Hills, MHA
Administrative Fellow
Yale New Haven Health
[email protected]
Logan Sangree-Hills was born and raised in Harrisburg, Pennsylvania. He earned a Bachelor of Arts in Economics from Gettysburg College and a master’s degree in Healthcare Administration from Seton Hall University. 

During graduate school, he worked full-time as a financial analyst at the University of Pittsburgh Medical Center. As a participant in the Finance Management Rotational Program, he spent three, year-long rotations within Hospital Financial Planning and Analysis, the Finance Project Management Office and Corporate Service Lines, before assuming the role of Senior Financial Analyst at UPMC Children’s Hospital.

Outside of his professional role, he enjoys traveling, spending time with his friends and family, cooking and watching movies.

lianne brown 
Lianne Brown, MHA
Senior Consultant, Business Development and Strategic Partnerships
Yale New Haven Health
[email protected]
Lianne Brown was born and raised in Richmond, Virginia. She earned a Bachelor of Science degree in Public Health from Tulane University and a Master of Health Administration from Tulane University. She also completed the post-baccalaureate, pre-medical program at the University of Virginia. 

Brown completed her administrative fellowship training with Yale New Haven Health in 2021, where she supported and implemented a number of strategic initiatives and operational projects throughout the health system. She is now a senior consultant on the Business Development and Strategic Partnerships team. In this role she is focused on building the Yale New Haven Health strategic growth plan and developing partnerships with external stakeholders.

Outside of her professional role, Lianne enjoys spending time with friends and family, traveling and is a certified Pilates instructor.

Madelyn Kaehler, MHA
Manager, Supportive Care Navigation and Integrative Medicine, Cingari Family Boutique
Smilow Cancer Hospital
[email protected]

Madelyn Kaehler was born in Minneapolis, Minnesota. She earned her Bachelor of Science degree in Kinesiology from the University of Minnesota and her Master of Healthcare Administration from the University of Kentucky, College of Public Health.

Kaehler completed her Administrative Fellowship training at Yale New Haven Health in 2021 where she supported initiatives in strategic planning, finance and oncology program development. She is now the manager of the Supportive Care Navigation, Integrative Medicine and the Cingari Family Boutique teams at Smilow Cancer Hospital. She broadly supports the Supportive Care departments at Smilow Cancer Hospital and is heavily involved in strategic operations for the teams she manages. 

Outside of her professional role, she enjoys spending time with friends and family, exercising, attending sporting events and traveling.  

Lewis Goodrum, MHA
Associate Director, Regional Practice Operations
Northeast Medical Group
[email protected]

Lewis Goodrum was born and raised in Dallas, Texas. He earned his Bachelor of Science in Public Health from Brigham Young University and his master’s degree in Health Administration from The Ohio State University’s College of Public Health. 

Goodrum completed his administrative fellowship training at Yale New Haven Health and supported initiatives in hospital acquisitions, ambulatory care facility planning, patient experience and business development. He is now an associate director of Regional Practice Operations for Northeast Medical Group. He is responsible for all day-to-day operations of 15 medical practice locations, including services of Internal Medicine, Gastroenterology, Pediatrics, Walk-in, Allergy and Telehealth.

Outside of his professional role, he enjoys spending time with his wife and children, reading, exercising, hiking and participating in local triathlons.

Marie-Helene Gratton, MBA, MPH
Interim Vice President, Digestive Health and Administration
Yale New Haven Hospital
 [email protected]

Marie-Helene Gratton was born and raised in Montreal, Canada. She received her undergraduate degree in Finance from McGill University and graduate degrees in Business Administration and Public Health from Yale University.

She began her career at Yale New Haven Hospital in 2007 as an Administrative Fellow and has collaborated on a number of strategic projects during her tenure, including establishment of a transfer center (Y-Access), creation of initial system-wide service line plans, planning and managing the acquisition and integration of the former Hospital of Saint Raphael. She also worked on the conceptualization and initial planning for the Center for Clinical Neurosciences at the Saint Raphael Campus. She currently leads the Digestive Health service line for Yale New Haven Health. This service line provides comprehensive, cutting-edge medical and surgical treatments for gastrointestinal issues.

Prior to joining Yale New Haven Hospital, Gratton worked for Bombardier and IMS Health as an Internal Consultant, where she conducted program risk assessments as well as market and financial analyses of new business line acquisitions.

Outside of her professional role, she enjoys spending time with her husband, children, cats and friends. 

yollanda london 
Yollanda London, MPH
Interim Chief Strategy Officer 
Yale School of Medicine, Yale Medicine Administration
[email protected]

Yollanda London was born in Guyana and raised in Jamaica, Venezuela, and Costa Rica. When she was 14 years-old, she moved to the United States to attend a boarding school in Connecticut. She earned a bachelor of science degree from Southern Connecticut State University and her MPH from the Yale School of Public Health.

After completing the administrative fellowship, she took a role in operations in Yale New Haven Hospital’s ambulatory division. She eventually transitioned to business development with Yale New Haven Health. She continued to broaden her experiences with integrated delivery systems by accepting leadership positions for various healthcare organizations. She now works for Yale Medicine as Director, Strategy and Program Development and interim Chief Strategy Officer. 

Outside of her professional role, she enjoys spending time with her family, running and working out. 

Theresa Zinck-Lederer, MPH, CPMSM, CPCS
Executive Director, Medical Staff Services
Medical Staff Administration
Yale New Haven Health
[email protected]

Theresa Zinck-Lederer was born and raised in Connecticut. She earned her Bachelor of Arts degree from Wesleyan University and master’s degree in Public Health with a concentration in Health Policy and Administration from the Yale University School of Epidemiology & Public Health.

She completed her administrative fellowship training which included supporting hospital quality improvement projects. One such project involved the evaluation of first case start times in the operating rooms. She also supported strategic planning and marketing initiatives. In the latter part of the fellowship, Zinck-Lederer worked with the medical staff and administrative leadership to establish a Yale New Haven Hospital medical staff independent physician group.

Zinck-Lederer has continued her career at Yale New Haven Hospital and, subsequently, Yale New Haven Health to support the administrative processes related to physicians, the medical staff and each of the health system’s Chief Medical Officers. Her current focus is on the standardization of operations and foundational documents including privileging and credentialing, medical staff bylaws and medical staff policies.

Outside of her professional role, she enjoys spending time with her husband, family and her Yorkshire terrier, walking and going to the beach  

Coffee Chats

Join current and former administrative fellows as they share their experiences and answer your questions about the program via Microsoft Teams.

For more information about these one-hour sessions contact Susan Castagna at [email protected] or 203-200-3719.

Live Webinar

  • 2:30 pm, Wednesday, Aug. 16

Coffee Chats

  • 8 am, Wednesday, Sept. 6 
  • Noon, Tuesday, Sept. 12
  • 5 pm, Thursday, Sept. 21