2009
PhD in Archaeology at Leiden University

2002
MSc Biology at Utrecht University.

2013 - 2015
Postdoc Archaeobotany at the Graduate School ‘Human Development in Landscapes’ and Institute for Prehistoric and Protohistoric Archaeology, Kiel University.

2011 - 2013
Marie Curie IEF Research Fellow at the Institución Milá y Fontanals, Spanish National Research Council (CSIC), Barcelona. Project: Development of identification criteria of non-dietary crop products of Eurasian cereals by phytolith analysis.

2010 - 2011
Archaeobotanist in commercial archaeology.

2008 - 2009
Marie Curie Research Fellow in the Transfer of Knowledge Programme “Integrated Archaeobotanical Research” at the University of Sheffield.

2003 - 2009
PhD student in the NWO-program “The Malta Harvest: from Hardinxveld to Noordhoorn: from forager to farmer” at Leiden University.

2015
Out, W.A, M. Madella. Towards improved detection and identification of crop by-products: morphometric analysis of bilobate leaf phytoliths of Pennisetum glaucum and Sorghum bicolor. Quaternary International, doi: 10.1016/j.quaint.2015.07.017

2015
Ball, T.B., Davis, A.L., Evett, R.R., Ladwig, J.L., Tromp, M., Out, W. Portillo, M. Morphometric analysis of phytoliths: recommendations towards standardization from the international committee for phytolith morphometrics. Journal of Archaeological Science, doi 10.1016/j.jas.2015.03.023.

2015
Out, W.A., M. Madella. Morphometric distinction between bilobate phytoliths from Panicum miliaceum and Setaria italica leaves. Archaeological and Anthropological Sciences, doi 10.1007/s12520-015-0235-6.

2014
M. Madella, J.J. García-Granero, W.A. Out, P. Ryan, D. Usai. Microbotanical Evidence of domestic cereals in Africa 7000 years ago. PLoS ONE 9(10): e110177.

2014
Out, W.A., J.F. Pertusa Grau. M. Madella. A new method for morphometric analysis of opal phytoliths from plants. Microscopy and Microanalysis 20(6), 1876-1887.

2013
Out, W.A., C. Vermeeren, K. Hänninen. Branch age and diameter: useful criteria for recognising woodland management in the present and past? Journal of Archaeological Science 40 (11), 4083-4097.

2013
Out, W.A., Verhoeven, K.. Late Mesolithic and Early Neolithic human impact at Dutch wetland sites: the case study of Hardinxveld-Giessendam De Bruin. Vegetation History and Archaeobotany 23 (1), 41-56.

2012
Out, W.A.. What’s in a hearth? Seeds and fruits from the Neolithic fishing and fowling camp at Bergschenhoek, the Netherlands, in a wider context. Vegetation History and Archaeobotany 21 (3), 201-214.

2010
Out, W.A.. Firewood collection strategies at Dutch wetland sites in the process of neolithisation. The Holocene 20 (2), 191-204.

2010
Out, W.A.. Integrated archaeobotanical analysis: human impact at the Dutch Neolithic wetland site the Hazendonk. Journal of Archaeological Science 37 (7), 1521-1531.

2009
Out, W.A.. Sowing the seed? Human impact and plant subsistence in Dutch wetlands during the Late Mesolithic and Early and Middle Neolithic (5500-3400 cal BC). Archaeological Studies Leiden University 18.

2009
Out, W.A.. Reaction to R.T.J. Cappers and D.C.M. Raemaekers ‘Cereal cultivation at Swifterbant? Neolithic wetland farming on the North European Plain’. Current Anthropology 50 (2), 253-254.

2008
Out, W.A.. Neolithisation at the site Brandwijk-Kerkhof, the Netherlands: natural vegetation, human impact and plant food subsistence. Vegetation History and Archaeobotany 17 (1), 25-39.

2008
Out, W.A.. Growing habits: delayed introduction of crop cultivation at marginal Neolithic wetland sites. Vegetation History and Archaeobotany 17 (suppl.1), 131-138.

2008
Out, W.A.. Selective use of Cornus sanguinea L. (red dogwood) for Neolithic fish traps in the Netherlands. Environmental Archaeology 13.1, 1-14.