Builders
Who was the master builder of the Opera di Santa Maria Maggiore?
Leaning Tower of Pisa
Leaning Tower of Pisa Civita Castellana Cathedral Leaning Tower of Pisa Dilwyn Lewis Saint Mary of the Snows
Leaning_Tower_of_Pisa-Builders Civita_Castellana_Cathedral-Abstract Leaning_Tower_of_Pisa-Timeline Dilwyn_Lewis-Abstract Saint_Mary_of_the_Snows-Church
 One possible builder is Gerardo di Gerardo. His name appears as a witness to the above legacy of Berta di Bernardo as "Master Gerardo", and as a worker whose name was Gerardo.  A more probable builder is Diotisalvi, because of the construction period and the structure's affinities with other buildings in Pisa. But he usually signed his works, and there is no signature by him in the bell tower.  Giovanni di Simone was heavily involved in the completion of the tower, under the direction of Giovanni Pisano, who at the time was master builder of the Opera di Santa Maria Maggiore. He could be the same Giovanni Pisano who completed the belfry tower.
The Cathedral of Civita Castellana (Italian: "Cattedrale di Santa Maria Maggiore" of "Santa Maria di Pozzano") is a church in Civita Castellana, central Italy. 
  On January 5, 1172, Donna Berta di Bernardo, a widow and resident of the house of dell'Opera di Santa Maria, bequeathed sixty soldi to the "Opera Campanilis petrarum Sancte Marie". The sum was then used toward the purchase of a few stones which still form the base of the bell tower. On August 9, 1173, the foundations of the Tower were laid. Nearly four centuries later Giorgio Vasari wrote: "Guglielmo, according to what is being said, in year 1174 with Bonanno as sculptor, laid the foundations of the bell tower of the cathedral in Pisa." Giorgio Vasari indicates that Tommaso di Andrea Pisano was the designer of the belfry between 1360 and 1370. On December 27, 1233, the worker Benenato, son of Gerardo Bottici, oversaw the continuation of the construction of the bell tower. On February 23, 1260, Guido Speziale, son of Giovanni, a worker on the cathedral Santa Maria Maggiore, was elected to oversee the building of the Tower. On April 12, 1264, the master builder Giovanni di Simone and 23 workers went to the mountains close to Pisa to cut marble. The cut stones were given to Rainaldo Speziale, worker of St. Francesco.  
Monsignor Dilwyn Lewis (28 April 1924 – 10 July 2000) was a British clothes designer turned Roman Catholic priest who oversaw the restoration of the ancient Basilica di Santa Maria Maggiore in Rome.  
 Basilica di Santa Maria Maggiore, the Basilica of Saint Mary Major, in Rome Our Lady of the Snows Church, Woodstock, Vermont Saint Mary of the Snows Church, located in Reșița, Caraş-Severin, Romania Santa Maria Maggiore, Piedmont, a municipality in the province of Verbano-Cusio-Ossola, Piedmont, northern Italy Church of Havas Boldogasszony, Zebegény, Hungary, built 1908–1909 Santa Maria Maggiore, Bergamo, a church in Italy Santa Maria Maggiore, Florence, a church in Italy Santa Maria Maggiore, Gazzo Veronese, a church in Italy near Verona Santa Maria Maggiore at Guardiagrele, a church in the Abruzzo region of Italy  