Our Team

Executive Board

Rajiv Poduval

Rajiv Poduval, MD

Chief Executive Officer

Rajiv Poduval, MD

Chief Executive Officer

Rajiv Poduval, MD, is the CEO of Global Nephrology Solutions (GNS). Based on his experience in several leadership roles, he sensed the need for a physician-led practice management platform that could leverage the power of a growing physician network, robust data analytics, and creative population health initiatives to keep physicians relevant, independent, and at the center of patient-care delivery.

From 2011-2019, he served as the president of Southwest Kidney Institute (SKI), one of the country’s premier nephrology groups. Southwest Kidney Institute is a well-diversified company including Southwest Vascular Centers, Southwest Clinical Research Institute, SKI Properties, and SKI-DaVita Dialysis Centers. Under his leadership, SKI has expanded its physician base, achieved its desired market density, and strengthened its statewide business partnerships. He was instrumental in launching the SKI-DaVita-Banner ESCO in Phoenix and Tucson, bringing together three progressive organizations committed to value-based care.

In 2012, the Renal Care Organization was launched. He has served as RCO’s CEO since its founding, and the RCO’s growing national footprint is a testament to his commitment to build “partnerships without boundaries,” a model in which like-minded nephrologists could share a platform of clinical excellence committed to high-quality population health initiatives. He is also the CEO of RCO Analytics, which hosts one of the largest CKD databases in the country.

He completed both his nephrology and transplant nephrology fellowships at the University of Chicago and has been practicing both specialties in the Phoenix metro for 14 years. Under his guidance, SKI’s transplant division has developed into one of the largest in the state.

Dr. Poduval holds faculty appointments at both the University of Arizona College of Medicine and the Creighton University School of Medicine, and has been recognized for excellence in teaching. He is a member of RPA’s NCAP steering committee. He has also been recognized as a “top doc” in Phoenix Magazine.

Gurdev Singh

Gurdev Singh, MD

Chief Operating Officer

Gurdev Singh, MD

Chief Operating Officer
Dr. Gurdev Singh, MD CPHIMS is a founding partner and COO of Global Nephrology Solutions (GNS), a physician-owned and led practice management platform transforming the nephrology space through an expansive physician network and state-of-the-art data analytics. He completed his internal medicine residency at Geisinger Medical Center and fellowship in nephrology at SUNY Upstate Medical University in Syracuse, NY. He is a practicing nephrologist at Southwest Kidney Institute and is triple board certified in nephrology, clinical informatics, and internal medicine.  Dr. Singh holds a board position at Neighborhood Physician Alliance (NPA), is a finance committee member of the Banner Health Network, and a board member of Phoenix Tucson Integrated Kidney Care LLC (CMMI’s ESCO pilot). He held past appointments on the physician advisory boards for DaVita Falcon, Athenahealth and is immediate Vice President of Southwest Kidney Institute . He is a founding member and CIO of Renal Care Organization (RCO) and RCO Analytics LLC, entities that are both devoted to the deployment of high-quality population health initiatives achieved by developing one of the largest CKD databases in the country.
Dr. Singh’s interests, outside of direct patient care, cover a broad spectrum of IT and medical finance. He is passionate about creating and implementing automated processes across the organization, using IT tools and analytics with the goal of driving quality outcomes, and improving patient care while achieving financial success. Dr. Singh volunteered on the Health Information Management Systems Society (HIMSS) Ambulatory Committee, served as its co-chair, and was a liaison to HIMSS Clinical Business Intelligence committee. He also chaired the HIMSS work group “New to Medical Informatics.” He has successfully spearheaded several projects at SKI, resulting in improved clinical and financial outcomes. SKI achieved 100% provider attestation of meaningful use for three successive years. He is a serial entrepreneur and has been instrumental in launching and managing successful companies with goal of improving quality of healthcare across nephrology at a lower cost, while preserving physician independence.
Nikos Nikolopoulos

Nikos Nikolopoulos

Chief Growth Officer

Nikos Nikolopoulos

Chief Growth Officer
Guy Seay

Guy Seay

Chief Financial Officer

Guy Seay

Chief Financial Officer

Guy Seay is the Chief Financial Officer (CFO) at Global Nephrology Solutions (GNS). Guy brings decades of kidney care expertise and is passionate about aligning with physicians to improve the patient care experience.  Previously he held several finance leadership positions at DaVita, where he served as the CFO of the $8B dialysis division, GVP Finance of International, and CFO of the HealthCare Partners primary care practice in California with $2.8B in value-based care under management. Guy has an undergraduate degree cum laude from Duke and an MBA from Harvard Business School. Since 2015 he has served as Board Member/Treasurer of Bridge of Life an international non-profit focused on chronic disease healthcare programs and training.

Roy Marcus

Roy Marcus

Board Member

Roy Marcus

Board Member
Alberto Casaretto

Alberto Casaretto, MD

Board Member

Alberto Casaretto, MD

Board Member
Rohit Sharma

Rohit Sharma, MD

Board Member

Rohit Sharma, MD

Board Member
Bruce Perkins

Bruce Perkins

Board Member

Bruce Perkins

Board Member
Mark Vachon

Mark Vachon

Board Member

Mark Vachon

Board Member

Executive Team

Nick Carlucci

Nick Carlucci

Senior Vice President of Ancillaries and Growth Operations

Nick Carlucci

Senior Vice President of Ancillaries and Growth Operations

Nick Carlucci is the VP of Growth Operations at Global Nephrology Solutions (GNS). Nick comes from American Renal Associates (ARA) with over a decade of industry knowledge. In his time with ARA, Nick helped to build ARA’s dialysis business from the ground up, establishing partnerships and making long-lasting friendships Nephrologists across the United States. At ARA, Nick managed the business development team, Managed-care Contracting Department, And oversaw the financial operations of the joint venture dialysis clinics in the role of Vice President of Financial Operations and Corporate Development. Nick is incredibly excited to move upstream with GNS, in partnership with the nephrologists, to improve the care and outcomes of the patients at the Practice level to drive growth and innovation within this space.

Lauren Ellenburg

Lauren Ellenburg

Senior Vice President of Operations, Strategy and Informatics

Lauren Ellenburg

Senior Vice President of Operations, Strategy and Informatics

Lauren Ellenburg is the director of informatics and population health at Global Nephrology Solutions. Prior to this, she served as both regional area manager and director of informatics at Southwest Kidney Institute (SKI) where she was instrumental in streamlining operations and successfully overseeing SKI’s clinical EHR transition and meaningful use implementation. Her expertise in informatics and analytics led to an active role in creating a robust data analytics system through RCO Analytics, which today hosts one of the largest CKD databases in the country.

She partners with physicians and practices alike to translate data into tangible operational protocols and procedures driving value-based care and bringing service excellence to patients. After spending nearly a decade in healthcare, Lauren understands the evolving landscape and the need for cost-effective population health initiatives.

Lauren has led several initiatives that positively affect the care of the high-risk, vulnerable CKD population, including ED diversion programs, transitional care clinics, and chronic care coordination platforms. Her success derives from a sound understanding of the complexities of the evolving healthcare system and the constant need to lead change in the private practice environment.

Lauren currently oversees the analytics team and has been charged with launching our national chronic care coordination platform.

Lauren earned her MBA from the Tepper School of Business at Carnegie Mellon University in May 2018 and also holds a Bachelor of Science degree in Finance from Arizona State University.

Steven Henry

Steven Henry, PharmD

Senior Vice President of Health Economics

Steven Henry, PharmD

Senior Vice President of Health Economics
Deepa Shah

Deepa Shah

Senior Vice President of Payor Strategy and Contracting

Deepa Shah

Senior Vice President of Payor Strategy and Contracting
Sima Aziz

Sima Aziz

Vice President of Marketing

Sima Aziz

Vice President of Marketing
Tally Bringas

Tally Bringas

Vice President of Human Resources

Tally Bringas

Vice President of Human Resources
Rocky Chanana

Rocky Chanana

Vice President of Business Development

Rocky Chanana

Vice President of Business Development

Rocky Chanana is the Vice President of Business Development at Global Nephrology Solutions (GNS). Rocky comes with 10 years of strategic advisory experience working with management teams, boards, and shareholders across a range of transaction types and industries. In his most recent role as Vice President in Jefferies’ Global Healthcare Group, he focused on advising the leading Physician Practice Management companies and investors in industries such as women’s health, veterinary, dermatology, optometry, and dental. He advised on over 25 closed transactions, totaling more than $20 billion in value. His transactional experience in buy-side, sell-side, equity private placement, joint-venture, debt financing, initial public offering, and strategic alternatives assignments for both public and private companies will be an asset to GNS, as we move into the growth and expansion phase.

Nilesh Joshi

Nilesh Joshi

Vice President of Analytics

Nilesh Joshi

Vice President of Analytics

Nilesh Joshi is the Vice President of IT and Analytics at Global Nephrology Solutions (GNS) and has 20 years’ experience in Information Technology leadership, Software Development and Project Management.

He provides the technology vision and drives innovation to deliver business solutions and improve operational efficiency. Nilesh leads the analytics team to provide population health strategies through enhanced data integration capabilities such as data mining and predictive modeling platform. He also manages the IT Services portfolio and supports infrastructure for GNS and member Practices.

Prior to joining GNS, Nilesh was the Chief Information Officer of Newtek Business Services Corp and has held progressively increasing responsibilities in Retail, Utilities, and Financial services industries.

Nilesh holds an MBA in International Business from W.P. Carey School of Business at the Arizona State University and a Bachelor’s degree in Electrical Engineering (first class with honors) from University of Mumbai (Bombay), India.  He is a certified Project Management Professional (PMP) and member of the distinguished National Scholars and Honor Society, Society of Information Management (SIM), and Phoenix CIO Roundtable Forum.

Myles McAllister

Myles McAllister

Vice President of Market Development, Southeast Region

Myles McAllister

Vice President of Market Development, Southeast Region
Dave Miller

Dave Miller

Vice President Value-Based Care

Dave Miller

Vice President Value-Based Care
Alex Plunkett

Alex Plunkett

Vice President of Strategic Initiatives

Alex Plunkett

Vice President of Strategic Initiatives
Robert Reed

Robert Reed

Vice President of Financial Planning and Analysis

Robert Reed

Vice President of Financial Planning and Analysis
Sherwin Singh

Sherwin Singh

Vice President of IT

Sherwin Singh

Vice President of IT
Nathan Warner

Nathan Warner

Vice President of Integration

Nathan Warner

Vice President of Integration

Director

Pamela Hartnett

Pamela Hartnett

Regional Director of Operations

Pamela Hartnett

Regional Director of Operations
Rebekah Guzman

Rebekah Guzman

Regional Director of Operations

Rebekah Guzman

Regional Director of Operations

Rebekah Guzman serves as Global Nephrology Solutions’ regional director of operations in the Florida market. In this role, she manages the operations and strategy development for each practice within the region. Rebekah has 25 years of healthcare experience with a focus on leading operations and process improvement; she is a certified Six Sigma Black Belt, trainer, and change agent. She began her healthcare career as a clinician in physical therapy.

Rebekah received her Bachelor of Science in Business Management and her MBA from the University of Illinois.

She resides in Tampa, Florida with her husband.

Michael

Michael Weimann

Regional Director of Operations

Michael Weimann

Regional Director of Operations

Global Nephrology Solutions (GNS) Expands Leadership and Broadens Network with Addition of Four Practices

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