Ernest Guevarra

Public Health Specialist, Spatial Epidemiologist, R Developer


I am an independent public health consultant with more than 20 years of professional experience in community and public health in humanitarian crises and developing country settings, including as a community health worker, medical doctor, and most recently as the Head of Valid Measures, the specialised metrics, analytics and technology unit of Valid International. I have expertise in spatial epidemiology, geostatistics, cartography and statistical programming. In my role as head of Valid Measures, I led the design, development and implementation of innovative surveys and assessments on health and nutrition and bespoke analytical approaches that leverage the advantages of Bayesian statistics and resampling techniques. I am a founding member of Katilingban, a collective of public health and nutrition experts and practitioners. I am currently a consulting research data scientist for EcoHealth Alliance to support its computational analytics work in support of pandemic preparedness and One Health research and a Senior Research and Teaching Associate at the Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford.

Work Experience

Senior Teaching and Research Associate

University of Oxford | October 2023 - present

I am a lecturer for the MSc in International Health and Tropical Medicine at the Center for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford. I lead the module on Open Science and Reproducible Research in R

  • Lecture postgraduate students on topics related to famines, development and humanitarian Interventions for health, and evaluation methods for development and health
  • Lead the organisation and teaching of module on Open Science and Reproducible Research in R

Consulting Research Data Scientist

EcoHealth Alliance | May 2022 - present

  • Support the creation of a database of active infectious disease research activities and research scientists in Africa
  • Conduct training in how to use the database and background in priority zoonoses
  • Provide Africa Centres for Disease Control and member states with direct technical support and subject matter expertise in One Health and zoonotic disease
  • Programmatically develop pipeline to acquire, standardise, and aggregate suitable data sources for the prediction of accidental introduction of zoonotic disease and organise the data in a version-controlled, structured database usable for analysis and modelling
  • Fit model to predict the frequency/risk of accidental zoonotic disease introduction in a country, based on a network representation of linkages between source and destination countries
  • Support model testing, performance assessment, and iterative model refinements to improve model suitability

Founding Member

Katilingban | July 2020 - present

  • Lead the development and implementation of the strategic direction of the collective
  • Lead the analytics and software development services unit of the collective

Research Data Scientist

EcoHealth Alliance | December 2020 - December 2021

  • Develop, maintain, update, and refine models of COVID-19 infection, spread and associated processes
  • Develop, maintain, update, and refine reports, visualisations, and dashboards of disease data and model results
  • Write and edit reports and summaries of results for various health, policy, public, and scientific audiences
  • Provide analyses and visualisations in response to inquiries from project partners and policy makers
  • Maintain, refactor, and document computer code for sharing, reuse, and publication
  • Support organizational data management, infrastructure, and modelling practices

Teaching Fellow

University of Oxford | July 2020 - October 2023

Lecture postgraduate students on topics related to famines, development and humanitarian interventions for health, and evaluation methods for development and health


Oxford COVID-19 Modelling Consortium Philippines | March 2020 - December 2020

  • Provided technical guidance and capacity building to the Philippines country team in adapting the CoMo Consortium model to the Philippine context
  • Developed analytical tools in R language for statistical computing to support the country team’s modelling efforts

Head of Measures

Valid International Ltd | 2017 - 2020

  • Led design, development and implementation of innovative approaches, techniques and products for surveys and assessments focusing on health and nutrition for purposes of programme monitoring and evaluation, impact assessment, programme coverage and access or any other metric/indicator estimation
  • Led the design and development of bespoke analytical techniques and the accompanying programming scripts and workflows for estimating various metrics/indicators, specifically leveraging Bayesian statistics, resampling approaches and Monte Carlo methods
  • Trained and supervised a team of 5 survey technicians and data analysts

Surveys and Assessments Specialist

Valid International Ltd | 2015 - 2017

  • Led Valid International’s Community-based Management of Acute Malnutrition (CMAM) coverage assessment team and has conducted coverage surveys in Somalia, Kenya, Ethiopia, Zambia, Nigeria, Niger, India and Ghana
  • Co-developed a spatial sampling technique called Simple Spatial Sampling Method (S3M) for use in large-scale multi-indicator surveys that reports and maps indicator results at high spatial resolution at a national or regional level
  • Co-developed a low-cost, rapid assessment method for assessing nutritional status of children, women and elderly

Technical Advisor

Valid International Ltd | 2010 - 2015

Provided technical support and evaluation of nutrition programmes for the treatment of severe and moderate acute malnutrition and worked on all areas related to the design and implementation of CMAM programmes, including: identification of barriers to health services; establishment of outpatient clinics in local health centres; case-finding; advice on logistics of community outreach programmes; advice on integration of systems with local, regional and national ministry of health programmes; training programmes for partner NGOs and local ministry of health medical and logistics staff; support and evaluation of programme systems including community outreach, case-finding, programme admission, triage and referral, discharge, case follow up and patient recording systems; establishment of stabilisation centres within hospitals; and evaluation of nutrition programmes at all stages.


Valid International Ltd | 2009 - 2010

Supported the lead consultants and experts in the setup, monitoring and evaluation of community-based manageement of acute malnutrition (CMAM) programmes in various countries.

Child Protection Advisor

Save the Children in Sri Lanka | 2007 - 2008

Responsible for technical advice and practical field level lead, and mentoring to the project teams; District level liaison on project-related matters with UNICEF and other stakeholders in districts of coverage; Supporting project teams in documentation of project experiences and timely reports; Directly handle cases of children in need of special protection in liaison with UNICEF; Participate in assessments for closing of cases; and Training of field level project teams on handling children associated with armed groups.

Emergency Focal Point

UNICEF Somalia | 2007

Direct emergency preparedness and response in the central south zone of Somalia; Manage emergency assessments in areas relevant to UNICEF’s core commitments to children specifically in the areas of child protection and HIV/AIDS; Ensure systems and actions are in place to meet UNICEF’s core commitments to children; Liaise with local UNICEF partners and provide technical support to their activities; Ensure regular communication between central south zone team and the rest of the section and the Emergency Management Team (EMT); Support monitoring and evaluation of activities; Provide regular updates and assessments on situation in the zone and its impact on activities.

Psychosocial Coordinator

International Rescue Committee | 2005 - 2006

Oversee the strengthening of IRC Uganda’s psychosocial program activities integrating them into other key activities such as economic development, HIV/AIDS, and community dialogue/peace building; Conduct trainings and other capacity building activities for IRC’s local partners; Developing innovative ways to access remote communities, with a view to supporting community structures for promoting the safe, healthy and sustainable reintegration of former abductees into their communities of origin; Ensure conduct of regular follow up on former abductees, monitoring their reintegration process; Ensure community and peer support networks are promoting the process of reintegration; Examine degree to which IRC’s psychosocial programs are implemented and monitored in a participatory and community-based manner and recommend/implement improvements.

Community Organiser and Project Manager

Balik Kalipay | 2002 - 2004

Implementation of a psychosocial support program for children through training and debriefing of teacher and youth volunteers and facilitation and organization of community support and participation; Supervision of staff community trainers; Provision of emergency medical and psychiatric services; Project evaluation; Project management – administrative and financial oversight.



Open Source

The nutriverse is a collection of tools and guides developed in R for use in nutrition and nutrition-related data collection and analysis. The nutriverse is for anyone who works with nutrition and nutrition-related data be that in collection, processing and analysis.


Open Source

RapidSurveys develops methods and tools that facilitate robust and efficient health and nutrition surveys data collection, analysis and reporting.



  • 2018 · Impact evaluation of the World Food Programme’s moderate acute malnutrition treatment and prevention programmes in Sudan
  • 2016 · Assessing program coverage of two approaches to distributing a complementary feeding supplement to infants and young children in Ghana
  • 2016 · Household coverage of fortified staple food commodities in Rajasthan, India
  • 2012 · Semi-Quantitative Evaluation of Access and Coverage (SQUEAC)/simplified lot quality assurance sampling evaluation of access and coverage (SLEAC) technical reference