Born in Oleggio Novara in 1927, Carlo Mazzeri graduated with a degree in architecture from the Istituto Universitario di Architettura in Venice in 1956. After an early collaboration with Carlo Scarpa in Venice, he took part in the competition for the Colonia Olivetti in Brusson and the Carrara Chamber of Commerce with Mario Righini's studio, and took one of the top places.
In 1957 Mazzeri designed the cocktail shaker "870" with Luigi Massoni, which was one of the first Alessi objects designed by external collaborators, and which is still in production and can be found in bars worldwide. In the '60s and '70s he and Anselmo Vitale co-designed a complete collection of objects for Alessi, primarily for use in the hotel industry. In addition to the design and creation of consumer products, he has also been involved in civil and industrial construction.