Theodoros Lazaris was born in Livadia in 1882.

In 1906 he enrolled at the School of Fine Arts, Athens, where he studied painting under Georgios Jakobides, Georgios Roilos and Dimitrios Geraniotis with a scholarship from the Municipality of Livadia. During World War I, between 1912 and 1918, he joined the armed forces. He graduated in 1919.

The majority of his work is inspired by Greek rural landscape and greatly influenced by impressionism as he always kept close links with France. In his work, the spectator can witness the impressionistic quality of light, brushstroke and subject matter creating works depicting Greek nature and its atmospheric variations with a poetic feeling.

Lazaris received many awards for his work including the Medal of the City of Paris and the Order of the Patriarch of Alexandria.

The National Gallery of Greece staged a large-scale retrospective exhibition of his work in 1974. In 1934 he participated at the Venice Biennale and in 1969 at the Salon de l’Art Libre in Paris.

His work can be found in the National Gallery of Greece, the Municipal Gallery of Athens, the Municipal Gallery of Rhodes, the Koutlides Collection, the Averoff Gallery and many other public and private collections.