Leadership Team


Our community creates a culture that is always looking forward to what is possible.

Executive Team


An engaged team focused on creating the best resident experience.

Nadia Geigler

Chief Executive Officer

Nadia Geigler has worked in not-for-profit aging services since 1999.  In 2016, she joined The Admiral at the Lake as COO and transitioned into the role of CEO in 2017.  Nadia serves on the LeadingAge Illinois Board of Directors, on the Uptown United Board of Directors, is a member of the LeadingAge Illinois CCRC Cabinet, and serves as a design team member and the facilitator for the LeadingAge Illinois Leadership Academy.  Nadia is a graduate of the Academy herself having gone through the life-changing experience of the LeadingAge national Academy in 2011-2012.  Nadia holds a Bachelor of Arts and a Masters of Management in Nonprofit Administration along with several related licenses and certifications.  Nadia lives in the Jefferson Park neighborhood of Chicago with her two daughters, two dogs, and one husband.

R.J. Zielinski

Chief Financial Officer

R.J. Zielinski joined The Admiral in December of 2021. He has worked on the financial side of not-for-profit aging services since 2007. R.J. holds a Bachelor of Science in Accounting and Finance from Marquette University and is a graduate of the 2021 LeadingAge Illinois Leadership Academy. R.J. serves on the board of directors for a local community health agency that focuses on mental health, senior services, and LGTBQ+ services for youth. He and his wife live in Roselle and have two daughters and three dogs.

Jennifer Deitelhoff

Director of Resident Services

Jennifer Deitelhoff has been with The Admiral at the Lake since 2009.  She has worked in Retirement Living for 16 years in a large variety of roles, including Activities, Operations, and Sales.  Jennifer graduated from Eastern Illinois University with a degree in Sociology and Political Science. She and her husband live in Arlington Heights and have two daughters.  In her spare time, Jennifer enjoys gardening, doing household projects, running, and being with family and friends.

Mark Dubovick

Health Services Administrator

Mark Dubovick has worked in the field of Long Term Care and Aging Services since 2001 and has been a licensed nursing home administrator since 2007. Mark holds an associate of art’s degree from the City Colleges of Chicago and graduated with a bachelor’s degree in management from Loyola University Chicago in 2017. He has been a licensed emergency medical technician (EMT) since 2011. Mark is a graduate of the 2021 LeadingAge Illinois Leadership Academy and serves as a member of the Leading Age Illinois Assisted Living Cabinet.

Angela Jalloh

Director of Nursing

Angela Jalloh has worked in many capacities in long-term care. While a C.N.A, she began her nursing education, eventually earning L.P.N, R.N., and B.S.N. degrees. Before coming to The Admiral at the Lake, Angela served in another long-term care community for three years as Assistant Director of Nursing. She also worked as a college nursing instructor for two years. “My motivation is to shift the way nursing interacts with residents and to incorporate each resident’s preference, perspective, background, and opinions into daily care,” Angela says.  Angela is a graduate of the first LeadingAge Illinois Leadership Academy class and she currently serves the LeadingAge Illinois association through her appointment to the Skilled Nursing Cabinet.

Akintunde Littlejohn

Director of Information Technology

LJ obtained extensive health care experience as the IT Manager for a network of Community Health Care Centers located in Oak Park, IL. The bulk of his 15+ years of Information Technology experience was acquired as the IT Manager of a leading Futures Brokerage located in the Chicago Board of Trade. LJ possesses an Associate of Applied Science in Computer Information Systems and is also one of the Admiral’s Compliance Liaisons, the HIPAA Security Officer, and the interim HIPAA Privacy Officer.

Dan Burns

Director of Culinary Services

Dan has worked in the senior living field for the past six years and as a Dining Services Director for the past three years. Before working in senior living communities, Dan was Sous Chef in a fine dining restaurant in Silverlake, California, while earning an associate’s degree from Le Cordon Bleu in Pasadena, California. Prior to his culinary work, Dan was a lighting designer and master electrician in the theater and entertainment industries in both Los Angeles and New York City.

Katie O’Brien

Director of Sales & Marketing

Katie O’Brien joined The Admiral in 2019.  She has sales and marketing experience spanning more than 20 years and the past eight years in healthcare business development in the Chicago area. Katie has an entrepreneurial spirit, was a Chamber of Commerce Executive Director for ten years, and helped build two successful start-up consulting companies. She earned her MBA in 2014 and is a 1990 graduate of the University of Notre Dame.

Samantha Victor-Alvarado

Director of Human Resources

Samantha Victor-Alvarado has worked in the field of long-term care and aging services since 2014 within the realm of Human Resources. Samantha joined The Admiral in January 2020 as HR Director and has been SHRM-SCP certified since February 2021. Samantha has a Bachelors’s in Communications from the University of Illinois- Champaign/Urbana and a master’s in Business Administration from DeVry University. Samantha is an Illinois LeadingAge Leadership Academy graduate of 2020. Samantha is the appointed Compliance Official for the Admiral. She currently lives in the Ravenswood neighborhood of Chicago with her husband.

Connect with Chicago’s Senior Living Experts

The Admiral at the Lake’s Residency Counselors are here to help with anything you need to know about the senior living experience.