| Jr. Res. Fellow | Wolfson College, Cambridge | 2004–2008 |
| British Academy Postdoc. Fellow | Faculty of History, University of Cambridge | 2005–2008 |
| Associate Pastor | Cambridge Pres. Ch., (EPCEW), Cambridge, UK | 2006–2008 |
| Director of Cambridge Summer Progr. | Westminster Seminary California | 2006–2008 |
| Visiting Professor | Westminster Seminary California | 2006–2010 |
| Adjunct Professor | Westminster Theological Seminary | 2007 |
| Sr. Res. Fellow | Wolfson College, Cambridge | 2008–2010 |
| Associate Pastor | Grace OPC, Vienna, VA | 2008–2015 |
| Vis. Lecturer | Reformed Theological Seminary (several locations), Washington DC | 2008–2011 |
| Vis. Fellow | Wolfson College, Cambridge | 2010–2013 |
| Adjunct Professor | Reformed Theological Seminary (several locations), Washington DC | 2011–2013 |
| Adjunct Professor | Hist. Theological, Puritan Reformed Theological Seminary | 2012 |
| Associate Professor | Reformed Theological Seminary (several locations), Washington DC | 2013–2015 |
| Res. Fellow | Folger Shakespeare, Liby., Washington, DC | 2013 |
| Hon. Res. | | 2014 |
| Chancellor’s Professor | Reformed Theological Seminary (several locations), Washington DC | 2015 |