Asuncion Office
Located strategically in the heart of South America, our Asuncion office serves the unique needs of the brown water fleets operating along the Parana River and surrounding inland waterways. With many of these vessels insured by international and local underwriters, our Asuncion team provides vital surveying services to ensure the safe and efficient operation of river fleets.
Known for their deep regional knowledge and hands-on approach, our surveyors offer cost-effective solutions that meet the highest standards of the marine insurance industry.
Experienced Team Members

Martin J is dealing with all type of H&M casualty work, including major machinery and hull damages, as well as condition surveys for major H&M Underwriters and P&I Clubs in the Americas region
Martin have a solid experience in investigating and dealing with incidents at port terminals on behalf of major H&M Underwriters and major P&I Club. He also achieved the certification as operator for Sherlog TA ultrasonic testing and is supervising the US testing and certification scheme for Surveyors in Buenos Aires office.
PROFESSIONAL EXPERIENCE and QUALIFICATIONS:
- Apprentice Engineer at shipyard (1 year)
- Independent Surveyor for local Underwriters in Argentina (3 years).
ACADEMIC QUALIFICATIONS:
- MSc Naval Architect & Marine Engineer, National University of Buenos Aires
Martin J. Rivero
Principal Surveyor / Partner+54 9 11 5140 7212
asuncion@ertemrivero.com

EDUCATION
- 2002 - 2007: Master of Science in Mechanical Engineering.
Instituto tecnológico de Buenos Aires (ITBA)
WORK EXPERIENCE
TDR Naval - Partner:
- 2019 - Present: Engineering Consultancy. Fuel control systems for river towboats.
Independent Surveyor:
- 2018 - Present: Marine surveyor. Main responsibilities: o Hull & Machinery, P&I Claims Surveyor, condition survey.
Evdemon & Partners:
- 2014 - 2018: Marine surveyor – Engineering Consultant. Main responsibilities:
o H&M and P&I Surveyor.
o Pre-purchase / Condition surveys of tanker and bulk carrier vessels.
o Engineering consultancy for ship owners.
Ultrapetrol S.A. – UABL S.A.:
- 2013 - 2014: Project Manager - Espiritu Paraguayo tugboat major re-built. USD 6M project
- 2013 - 2014: Project Manager - Parana Iron major conversion from Ocean Going Crude
Oil Tanker to Iron Ore Storage and Transfer Station. USD 13M project
- 2012 – 2014: Fleet Human Resources Manager - Responsibilities:
o Compliance with ISM / SIRE vetting inspections / TMSA requirements for crew and office staff.
o Crew and office staff training programming.
- 2006 - 2012: Engineer - Ship Owning division - Responsibilities:
o Budgeting & running costs control of tanker and container vessels.
o Hull and Machinery insurance claims management.
o Superintendent during dry docks and mayor repairs.
o Preparation of tanker vessels for SIRE vetting inspections.
LANGUAGES
- Spanish (native), English (fluent), Portuguese (working knowledge).
COURSES
- 2016 Marine Insurance Seminar – Lloyds Maritime Academy, London.
- 2017 SDT – IMCS Hatch Cover and Ultrasonic Testing Course, Rio de Janeiro.
Oscar Cherro
Senior Surveyor+54 9 11 6860 1116
asuncion@ertemrivero.com

Carlos is dealing with the range of H&M casualty work handled as an Associate Surveyor of our Asuncion office, for the inland waterway fleets operating in the river Paraguay-Parana for major H&M Underwriters, and condition surveys on behalf of P&I Clubs.
He has significant background in repair works in shipyard within are Asuncion area, and is an expert in structural assessment and hull damage repairs for inland waterway barges and towboats.
PROFESSIONAL EXPERIENCE and QUALIFICATIONS:
- Technical Superintendent (7 year)
ACADEMIC QUALIFICATIONS:
- MSc Electromechanical Engineer, National University of Asuncion
On-going MSc in Naval Engineering, National University of Asuncion
Carlos A. Ferreira
Surveyor+595 981 756749
asuncion@ertemrivero.com

WORK EXPERIENCE
2025 – to date ERTEM, RIVERO & PARTNERS
Staff Surveyor
2024 – 2024 EVDEMON & PARTNERS
Staff Surveyor
2022 – 2024 INTERBARGE
Senior Superintendent
2022 – 2022 ATRIA LOGISTICA
Superintendent of Tugboats
2013 – 2022 HIDROVIAS DO BRASIL
Maintenance Supervisor
EDUCATION
2019 Universidad Catolica Nuestra Señora de la Asuncion
Electromechanical Engineer with a specialization in Electronics
2006 Centro Educacional Cristiano
Technical Bachelor's Degree in Administration
ADDITIONAL SKILLS
Languages: Native Spanish speaker, fluent in English and Portugues.
Programs: Advance knowledge of Microsoft Office, SAP, Proyect and Netsuit
Marcelo Ruiz Diaz
Surveyor+595 972 852300
asuncion@ertemrivero.com

Head of Administration
Lucas holds a BA in International Commerce/Trade and has worked in several administrative and accounting positions, one of them being in Australia. With a strong background in commerce and finance, he adds expertise to our accounting department, to streamline operations and implement improvements and new solutions.
Lucas is fluent in English and knowledgeable in Portuguese.
Lucas Jose Ghione
Head of Administration
Juliana provides general administrative assistance to Rio surveyors as well as being responsible for all receivables from invoicing to fee collection supervision for all our offices in South America.
She holds a BA from UVA (Universidade Veiga de Almeida) and concurrently with her job works towards acquiring an MBA in Foreign Trade from IBMR University Center.
Juliana Melo Calixto Da Silva
Administration
Agustin Rau
Administration+54 9 11 34520873
Gumersindo Sosa c/Austria, Duplex 5
Asuncion
Paraguay
+595 984 800029
asuncion@ertemrivero.com