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our team

Leadership for your journey on the path to exceptional value-based care

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Katherine Fowler

Chief Executive Officer

& Board Member

Katherine Fowler has more than 20 years of experience in healthcare management and holds an MHA from Virginia Commonwealth University and a Graduate Certificate in Population Health from Thomas Jefferson University. Her goal is to connect the independent practice community with cost-effective tools and strategies that bring results. She strives to create value and alignment between patients and providers with new care models and strategies. The result is a connected community of talented individuals sharing best practices and providing extraordinary care throughout New Jersey.

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Peter Carrazzone, MD

Board Member

Dr. Peter Carrazzone is president of Vanguard Medical Group (VMG) and the medical director of two primary care practices. His goal is to ensure VMG’s mission and vision are integrated in the organization’s strategy and goals. He has utilized change management initiatives and standardized workflows across VMG to improve retention and culture. For the past 11 years, he has been implementing population health strategies and teaching providers the importance of value-based care.

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Nalinoe Kernizan

Ambulatory Care Clinical Pharmacist

Nalie Kernizan provides comprehensive medication management to practice leaders. Her goal is to improve the control of chronic conditions and reduce healthcare expenditures. She educates medical assistants on how to properly review medications with patients and counsels providers on disease-specific treatment options. She has successfully helped reduce hemoglobin A1c by 2% in patients with uncontrolled diabetes through medication recommendations and helped achieve four stars in our medication adherence measures in two Medicare Advantage contracts.

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Saloni Joshi

Clinical Data Analyst

Saloni Joshi’s role is to develop an effective and insightful quality metrics dashboard that is used for operational decision-making, change management, and provider performance. She built the medical neighborhood infrastructure and successfully implemented a referral tracking system across 10 primary care locations to control specialist utilization. She has been supporting the population health team for the past four years and is always looking to find the best method of extracting and creating meaningful data.

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Robert Hillegass

Director of Technology Consulting

Robert Hillegass has been providing technology consulting services for over 12 years which has included supporting hardware, business software and various Electronic Health Record platforms. He has assisted clients with the transition from paper to EHR and subsequent customization, PCMH recognition, and numerous quality and value-based initiatives including MU, MIPS, CPCi, CPC+ and PCF. Robert works closely with practice managers and providers to identify opportunities for revenue growth and quality improvement then implements data-driven approaches that improve the quality of care and facilitate practice transformation.  


Thomas McCarrick, MD, MBI

Chief Population Health Officer
& Board Member

Dr. Thomas McCarrick has been practicing in geriatrics and family medicine for more than three decades. For the past 12 years, he has focused on population health strategies in primary care, growing his population health team from 1 to 7. Dr. McCarrick has built strong relationships with payers and other providers in New Jersey to promote value-based care initiatives. His goal is to always put the patient first and create programs that will benefit the overall health and wellness of the community.

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Sarah Wistreich, DO

Board Member


Alexandra Raspanti

Clinical Integration Coordinator

Alexandra Raspanti helps primary care practices enrolled in our Clinically Integrated Network, the Vanguard Partner Network, improve care and outcomes and reduce costs. She ensures standards across group are communicated, implemented, followed, and updated regularly.

Alexandra also serves as a medical neighborhood liaison between the practice and specialists. She holds a Master’s in Healthcare Administration from Seton Hall University and a Bachelor’s in Health Science from Sacred Heart University.

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Peter Rutherford

Chief Financial Officer 
Board Member

Peter Rutherford has more than 25 years of healthcare experience in finance, strategy, and administration. In his previous roles, he founded and was the CEO of an IPA-based global capitation risk contractor in New Jersey. Peter has extensive knowledge in the fields of medical billing and collections, medical records software implementation, actuarial consulting, and physician management. He enjoys working with organizations to develop strategies that deliver value and improve how practices manage their finances, review payer contracts, and reduce workflow inefficiencies in billing and collections.

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Lisa Hall

Vice President of Human Resources

Lisa Hall has 20 years of progressive leadership expertise in the pharmaceutical and medical industries. Her robust background in organizational development, strategic leadership coaching, training, and employee relations is pivotal to employee engagement, retention, and satisfaction, as well as culture transformation. She has led committees to transform an organization’s culture and develop creative ideas to get employees engaged. Her extensive success in talent acquisition has helped organizations source successful long-term candidates.

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Melissa Mothersil

Transformation and Quality Improvement Manager

Melissa Mothersil has more than 10 years of experience working in quality improvement. She is responsible for implementing essential education, services, and tools to achieve the quality and cost goals of VMG value-based contracts. She has enhanced workflow redesign, EHR optimization, quality measure reporting support, and ACO implementation. She cultivates in-depth relationships with practices, including conducting regular status meetings to set strategic priorities, report results, monitor utilization and costs, and identify opportunities for growth and savings.

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Feny Patel

Clinical Integration Coordinator

Feny Patel meets and onboards new practices in our CIN and provides continuing support as they navigate the landscape of value-based care. She also serves as a medical liaison between practices and specialists. She brings a passion for population health and the impact that it can have in building healthier communities. She holds a Master’s in Healthcare Administration from Rutgers University and a Bachelor’s in Business Administration from Monmouth University.

We are a team of primary care providers, administrators, and population health specialists sharing our innovative experience and expertise to inspire and transform the next generation of primary healthcare.

Dr. Sarah Wistreich is the medical director of the primary care practice in Cranford. She has initiated population health initiatives such as transitions of care, reaching quality metrics, and completing annual wellness visits. In her previous role, she obtained the NCQA PCMH Level 3 accreditation for the practice for four years. Dr. Wistreich has increased patient access through adjustments to physicians’ schedules to grow profitability while maintaining a high quality of care for patients.

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Daimion Haughton

Revenue Cycle Manager

Daimion Haughton brings more than 18 years of experience in the revenue cycle industry. His focus is on reducing inefficiencies in billing, data entry, charge correction, and payment entries by improving workflows and utilizing VHS technology platforms. In a single year, he has decreased our days in accounts receivable by 20% by developing customized, standardized aging reports and matrices. He also has shared important insurance updates during the public health emergency to primary care sites.

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