Dia Nichols, FACHE

Dia Nichols, FACHE

Chief Executive Officer

Dia Nichols, FACHE, has led Northside Hospital as the Chief Executive Officer since June of 2013. Dia has held multiple executive level positions in HCA since joining the company in 2001. His tenure includes serving as CEO of John Randolph Medical Center (Hopewell, VA); Chief Operating Officer of CJW Medical Center (Richmond, VA); Chief Operating Officer of John Randolph Medical Center (Hopewell, VA), and as Associate Administrator of West Florida Hospital (Pensacola, FL).

Dia received his Bachelor’s degree in Business Administration from South Carolina State University, and his Master’s degree in Healthcare Administration from Indiana University. He is a Fellow of the American College of Healthcare Executives and a member of the National Association of Health Services Executives. In 2012, he was named an “Up and Comer” by Modern Healthcare Magazine. He was also named as one of the Richmond, Virginia area’s Top 40 Under 40, as well as one of Richmond Magazine’s Top Healthcare Leaders Under 40.

Dia is active in the community, serving as a Board Member of the St. Petersburg Chamber of Commerce, as well as serving on the Executive Cabinet for the American Heart Association’s Heart Walk.


Peter Kennedy, MHA, FACHE

Peter Kennedy, MHA, FACHE

Chief Operating Officer

Peter joined Northside Hospital from Centennial Medical Center in Nashville, TN, where he served as the Associate Chief Operating Officer. Prior to joining the Centennial team, he worked with HCA Virginia at Chippenham and Johnston-Willis Hospitals (CJW) in Richmond, VA. He joined HCA in June of 2013 from Virginia Commonwealth University Health Systems (VCUHS) MCV Physicians, where he held the position of Associate Administrator of Business Development, focusing on community alignment and physician engagement.

Born in Salt Lake City, Kennedy received his bachelor's degree from the University of Phoenix and his Masters of Health Administration from VCU Medical College of Virginia campus.


Peggy Gatliff

Peggy Gatliff, MBA, CPA

Chief Financial Officer

Peggy Gatliff is currently the Chief Financial Officer at Northside Hospital after previously being the Division Controller for the last five years at the HCA West Florida Division. Peggy has more than 26 years of financial management experience, 20 of which has been in the healthcare industry, including 11 years with HCA. Earlier in her career, Peggy was Controller at Northside Hospital.

During the course of her career she has worked in a few other industries including broadcast and manufacturing before discovering the world of healthcare financial management. Prior to joining HCA, Peggy spent almost 10 years working in Physician Practice Management for companies including Medpartners (Diagnostic Clinic) and Vision 21, serving in PPM and Group Controller positions. Peggy joined HCA as part of the executive development program in March of 2004, interning at Methodist Hospital in San Antonio, TX. She joined the West Florida Division in March 2005 serving in Controller and CFO positions at hospitals within the Division until February 2012 when she was promoted into her role as Division Controller. Peggy is a CPA, holds a Bachelor’s degree from the University of South Florida and a Master’s in business with a focus in healthcare management from St. Leo University. Memberships held in HFMA (Healthcare Financial Management Association), and ACHE (American College of Healthcare Executives).

Outside interests include: competitive spearfishing, golf, and travel.


Ira Siegman, MD

Ira Siegman, MD

Chief Medical Officer

Ira Siegman, MD, has served as Chief Medical Officer at Northside Hospital since November of 2013. Dr. Siegman has over 10 years of medical administrative experience, and in his previous job, served as Vice President of Medical Affairs at Morton Plant North Bay Hospital. Prior to a career in medical administration, Dr. Siegman practiced cardiothoracic surgery for 12 years in the Tampa Bay Area at Regional Medical Center Bayonet Point, Brandon Regional Hospital, and Tampa General Hospital.


Ira Siegman, MD

John Polisknowski, RN

Chief Nursing Officer

John Polisknowski joined Northside Hospital as the Chief Nursing Officer in November 2017. Previously, John was the Assistant Chief Nursing Officer at The Medical Center of Trinity. John has a strong, and very diverse array of clinical experiences that he brings to Northside. His exposure includes emergency services, ICU, behavioral health, and various inpatient nursing units. John grew up in Jacksonville, FL. He attended the University of South Florida for his undergraduate education, Florida State College for Nursing, and Liberty University for his graduate education.


Rency Atly MSN, RN

Assistant Chief Nursing Officer

After being the Director of Med-Surg for over a year, Rency was named Assistant Chief Nursing Officer. She was born and raised in Kuwait. Rency moved to India to receive her BSN and graduated in 2002. She has been a nurse for over 15 years with clinical experience in Pediatric oncology, Med - Surg, PCU, ICU, and ER. Rency moved to the United States in 2006 and graduated from the University of Phoenix with a MSN in 2011. She has been with HCA for over 11 years having spent ten years at Palms of Pasadena Hospital as a Nursing Director before coming to Northside.


Joe Schlagheck

Joe Schlagheck

Vice President, Business Development

Joe has over 25 years of hospital senior leadership experience in the Tampa Bay area holding various administrative positions at Palms of Pasadena Hospital and with the last 13 years with Northside Hospital. Joe's current position is Vice President of Business Development and he provides support for Facility recruitment, physician contracting and oversight of the Graduate Medical Education program.



Tammy Rodriguez

Tammy Rodriguez

Vice President of Human Resources

Tammy came to Northside Hospital from Henrico Doctor's Hospital in Virginia, where she was the Director of Human Resources for almost six years. She has over 10 years with HCA in Human Resources and has served in a variety of roles throughout the organization. Tammy received her Bachelor's Degree in Management and Human Resources from the University of Phoenix and her MBA in Healthcare Administration from Western Governor's University.