Sekunda was born in 1953 in
Mansfield, Nottinghamshire, United Kingdom; his father was Polish. He studied ancient history and archeology at the
University of Manchester for his education, earning a BA in 1975. Staying in Manchester, he earned his PhD in 1981, with his thesis on
Cretan archers. Sekunda published journal articles in the 1980s and 90s, although also worked in industry. He returned to academia in 1997 to work at the Institute of Archeology and Ethnology of the
Polish Academy of Sciences in Warsaw. His
habilitation in 2002 was also with the Institute of Archeology; his resulting work was published in book form as ''Hellenistic Infantry Reforms of the 160's BC''. He later gained a position as an assistant professor at
Gdańsk University, and became a full professor in 2015. Sekunda has participated in various archaeological excavations in England, Poland, Iran, Greece, Syria and Jordan. He was a codirector of excavations, with Goran Sanev of the Archaeological Museum of Skopje, at in
North Macedonia, a joint Polish-Macedonian project that began in 2009. ==Selected works==