Born in Overschie in 1931, Alex Overeijnder studied at the Academy of Fine Arts in The Hague. He started his artistic career in the early fifties, drawing 'Willie Beer' in Revue magazine from 1952 to 1958. Throughout the 1950s and 1960s, he also made 'Lappy Loup' ('Lappy Knijm') for the newspaper Trouw, 'Flip en Flop' in Provinciale Dagbladpers, 'Floske' in Wereldkroniek, 'Daantje Durf' and 'Cardi en Karon' for Dafbode.
Overeijnder was one of the earliest local illustrators of covers for the Dutch Donald Duck weekly (presumably two covers in 1953, several more in 1958). He was also the author of the last six 'Pinkie Pienter' books, a series originally created by J.H. Koeleman, between 1958 and 1960.
Overeijnder made a comic strip version of the television puppetshow 'De Fabeltjeskrant' from 1969. Then came 'De Gabbers' and 'De Kroniek van Grondel' in De Telegraaf, 'Peter Pluim' in Eva, and 'De Froets' in NCRV Gids, which he had originally made as a TV animation series in 1974-75. Lex Overeijnder passed away in Heerenveen in April 1984.