Our leadership team

13SICK, National Home Doctor is Australia's largest network of home visiting doctors. Proudly Australian, our service has a 30 year history of providing urgent medical care after hours when GP Practices are closed. 13SICK combined the strengths of long term industry leaders: Family Care Medical Services; Melbourne Medical Deputising Service; and GPSolutions. More than 7,000 GPs trust 13SICK to look after their patients after hours.

Accredited to the standards of the Royal Australian College of General Practitioners, with Australian General Practice Accreditation Limited and GPAour reputation for quality care is built on the solid foundation of our Clinical Advisory Group.

Our Executive Management Team works collaboratively with our Clinical Advisory Group to ensure the business provides exceptional, accessible and sustainable healthcare.

Executive management team

  • John Pappalardo

    Executive Chairman

    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.

  • Dr Umberto Russo

    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.

  • Robert Turner

    Chief Financial Officer

    Robert is a finance leader with experience across a number of industries, including software, technology, hospitality, and gaming. He has held senior roles as Chief Financial Officer and Chief Operating Officer in ASX listed and PE owned companies over a career spanning 30 years. He brings to 13SICK experience in strategy formulation, business planning and execution, as well as strong financial control and governance.

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.

  • Dr Nicholas Demediuk

    Dr Nicholas Demediuk


    Medical Director - VIC

    • Medical Director: Parkmore Medical Centre
    • Medical Director: Dr Snip Vasectomy Clinics
    • Board member: AGPAL, AGPN, AAGP
  • Dr Bers Wenck

    Dr Beres Wenck

    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
  • Dr Umberto Russo

    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
  • Dr Bernd Lorenzen

    Dr Bernd Lorenzen


    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 
  • 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