AHN Leadership Team


Bob Sarkar, MBA, FACHE

President & CEO

Areas of Responsibility
  • Board & Governance Leadership
  • Strategic Planning
  • Budget & Financial Management
  • Payor Strategy & Relationships
  • Internal & External Partnership Development

Bob Sarkar joined CHI St. Vincent in 2015 as President  & CEO of the Arkansas Health Network (AHN), a Clinically Integrated Network (CIN) that was created in 2014. His focus has been to ensure that AHN succeeds in improving the quality of care at a lower cost, while improving the patient and provider experience across its network. Since his arrival, Bob has helped transform AHN into the largest and most successful CIN in Arkansas, and a national “Best Practice” in Value Based Care. Bob spear-headed AHN to be one of the top quartile of MSSP-ACOs in the industry that has successfully and repeatedly saved and received multi-million dollar shared savings from CMS.  Most recently, under Bob’s leadership, AHN successfully managed the 2020 CHI St. Vincent employee health plan population resulting in the highest quality score achieved among all CommonSpirit CINs and maximum pay-for-performance earnings.  For details of AHN’s current network and successes, please see our latest brochure:   AHN Brochure


Prior to leading AHN, Bob was responsible for population health management and innovative health plan development as the SVP of Operations/Value-Based Care for Premier Health based in Dayton, OH and as the RVP & Chief Strategy Officer for Presence Health based in Chicago, IL. In addition, he has provided hands-on advisory and program implementation services (as an embedded consultant-leader) to some of the leading healthcare organizations across the country, including Kaiser Permanente, Advocate, Johns Hopkins and Aetna. Most recently, he served as the National Leader of Healthcare and Practice Vice President for Capgemini. Bob earned his Master of Business Administration degree at the University of Illinois, Urbana-Champaign and earned a Bachelor of Science degree in Biotechnology at the University of Kentucky. He is a fellow of the American College of Healthcare Executives and multiple other professional organizations.


Lubna Maruf, MD, MBA

Chief Medical Officer & Market Vice President

Areas of Responsibility
  • Medical Leadership
  • Provider Engagement & Performance Improvement
  • Clinical Quality Strategy
  • Evidence-Based Guideline Implementation
  • Clinical Policies & Accreditation

Dr. Maruf is a three-time Board certified Internist and a graduate of the Aga Khan Medical University. She has a keen interest in the integration of behavioral health services in the primary care setting.

In her professional tenure, Dr. Maruf most recently served as the Medical Director for QualChoice (now affiliated with Centene Health Corporation). She also served Veterans through the Central Arkansas Veterans Healthcare System.  Among her many accomplishments, Dr. Maruf has gained statewide attention as an expert on Patient Centered Medical Home and was selected by the Veterans Administration to attend Community of Champions, a premier, 12-month coaching training program for physicians.

Rachel Longfellow, MHA

Market Director, Operations

Areas of Responsibility
  • Data & Analytics
  • Marketing & Communications
  • Legal & Compliance
  • Network Roster Management
  • Corporate Wellness

Rachel Longfellow has been a part of the development of AHN since 2013. As part of her Administrative Fellowship with CHI St. Vincent, she played an integral role in building AHN’s data infrastructure and standing up its Medicare Shared Savings Program. She became a full-time leader of AHN in 2016. Rachel continues to play a significant role in the development and implementation of AHN’s strategic plan and service delivery.

Camille Wilson, MSN, RN

Market Director, Population Health

Areas of Responsibility
  • Data Driven Care Management Strategy
  • Clinical Quality Improvement
  • Clinical Payor & Vendor Partnerships
  • Care Management Productivity Analytics
  • Post-Acute Care Coordination

Camille Wilson has been a leader with AHN since 2017. A nurse by background, she brings 15 years of hands-on experience in population health management, ambulatory care, acute care, nursing education and management. In her role, she has oversight of all clinical care management functions and has played an integral role in developing AHN’s care management program and capabilities.

Priyanka Muppidi, PharmD, MHI

Manager, Data & Analytics, Population Health

Areas of Responsibility
  • PHM Technology Implementation
  • Claims & Clinical Data Integration
  • Data Validation & Quality Assurance
  • Contract & Network Reporting

Priyanka Muppidi joined the AHN team in March 2021. Priyanka is a Pharmacist by background, earning her Pharm D from the Bharat Institute of Technology and her M.S. Health Informatics from Indiana University – Purdue University, Indianapolis, School of Informatics and Computing. She has applied these skills to roles including a Research Assistant at the Indiana University – Purdue University, Indianapolis, a Clinical Data Analyst at the Indiana University School of Medicine, and most recently as a Pharmacy Analyst for Amerihealth Caritas/Perform Rx.  She now brings this wonderful mix of clinical and technical expertise to AHN.

Hafeezah Brooks, RN

Nurse Manager, Population Health

Areas of Responsibility
  • Multidisciplinary Care Management Workflows
  • Care Management Staffing Oversight
  • Patient Outreach Strategies
  • Quality Gap Closure

Hafeezah Brooks joined AHN in 2013 as a RN Population Health Coach, and she assumed the role of Manager of Population Health in 2019.  She has 28 years of nursing experience in various areas, including population health management and care management.  In her role Hafeezah works very closely with the Director of Population Health, with oversight of clinical care management functions.