• Holocene archaeology in the Horn of Africa
• Archaeology of complex societies and middle-range societies in Africa
• Surface archaeology and settlement pattern analysis
• Ethnoarchaeology
• Landscape archaeology
• Household archaeology
• Cultural resource management and heritage conservation in Africa
• Rock art
• Culture contact in Eastern Africa and the Red Sea area
  
  

2008 The Archaeology of Ancient Eritrea. Trenton, NJ: Red Sea Press. (co-edited with Peter R. Schmidt and Zelalem Teka)

2004 Ancient Interaction across the southern Red Sea: new suggestions for cultural exchange and complex societies during the first millennium BC. In Trade and Travel in the Red Sea Region, edited by P. Lunde and A. Porter. Pp. 57-70. Oxford: Archaeopress.

2003 Abdur, Addi Q”yyeh, Agula, Aksumite Culture, and Bäsaka. Encyclopedia articles in Encyclopaedia Aethiopica, Volume 1, pp. 39, 77-78, 153, 186-188, 493, edited by S. Uhlig. Wiesbaden: Harrassowitz Verlag.

2001 Urban Precursors in the Horn: Early 1st Millennium BC Communities in Eritrea. Antiquity 75(290): 849-859. (with Peter R. Schmidt)

2001 Promoting Archaeologies Abroad, Anthropology News 42(5):41. (with Jonathan Walz)

1999 Archaeological Survey in the Adi Qeyeh Area, Eritrea. Nyame Akuma 51:25-35. (with Yoseph Libsekal)