Our leadership team

Executive management team

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  John Pappalardo

  Chief Executive Officer

  John is an experienced executive who has worked across a number of major industries including healthcare, logistics and manufacturing. He has a track record in driving increased shareholder value through business growth and profit improvement programs.

  John has spent the last 12 years in healthcare, taking particular satisfaction from the higher social responsibility that is bestowed upon healthcare organisations. He is of a clear view that quality and patient-centricity is at the heart of our business purpose.

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  Dr Umberto Russo
  MBBS, FRACGP

  Chief Medical Officer

  Dr Russo has more than two decades’ experience both in General Practice and medical deputising. He established Adelaide’s leading medical deputising service prior to merging with 13SICK, National Home Doctor. Dr Russo works closely with the Board overseeing clinical governance, policies and procedures.

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  David Wiggins

  Chief Financial Officer

  David Wiggins is a Chartered Accountant and experienced Chief Financial Officer and Company Secretary, having held the financial leadership roles in a number of ASX listed and private equity owned companies over the past 20 years.

Clinical Advisory Group

Our Clinical Advisory Group is a team of distinguished Medical Directors from around the country who oversee medical governance, and set and review all clinical policies and procedures. The Group also advises Board and Management and offers valuable mentoring to our team of Doctors.

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  Dr Nicholas Demediuk

  MBBS, BEd, FRACGP (LIFE MEMBER), DRANZCOG

  Medical Director - VIC

  • Medical Director: Parkmore Medical Centre
  • Medical Director: Dr Snip Vasectomy Clinics
  • Board member: AGPAL, AGPN, AAGP
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  Dr Beres Wenck
  MBBS, MAICD, FRACGP (HON) FAMA

  Medical Director - QLD

  • Rose-Hunt Award recipient (2012) for outstanding commitment to Australian General Practice
  • AMAQ President's Award (2007) for outstanding contributions to Queensland's health system
  • Past President, Brisbane North Division of General Practice
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  Dr Umberto Russo
  MBBS, FRACGP 

  Chief Medical Officer

  • Founding Partner, gpSolutions, Adelaide's leading medical deputising service prior to its merger with 13SICK. National Home Doctor
  • 23 years' experience in medical deputising
  • National Representative on various infection control and sterilization committees, including the National Infection Control Guidelines Steering Committee
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  Dr Bernd Lorenzen

  MB,BS, DRANZCOG 

  Medical Director - SA

  • General Practitioner with small practice in Kensington Park, Adelaide, SA
  • Continuing interest in bariatric medicine and work with bariatric surgeons
  • Past Chairman of RACGP SA and NT faculty and past federal councillor RACGP, with subsequent involvement in development of Regional Training Programs
  • Previously served with hospital Clinical Privileges committees and  SA Health Clinical Privileges Committees 
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  Dr Rajendra Prakash

  DSM, Dip Sports Med, FRACGP 

  Medical Director - QLD 

  • Medical educator for AMC bridging programme 2006-2014. RACGP examiner since 2006
  • Visiting Medical Officer - Queensland Health. Member - Service Improvement Group for Kilcoy hospital and Woodford correctional health
  • Active role in induction of new deputising GPs, supervision of DGPs , promoting ongoing education, conducting CPD activities, clinical reviews and audits
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