Speeckaert was born in Brussels, the son of Judocus Speeckaert and Barbara Vandenbroecke, and was baptised Ingelbertus in Brussels Minster on 12 May 1575.[2] He entered the Capuchin novitiate in Brussels, under the novice master Felix van Lapedon, taking the name in religion Bonaventura. He was professed as a Capuchin on 14 July 1593, giving his age as 23.[3] In 1597 he was living in Tournai. As a young priest in 1603 he was made a prior and put in charge of the construction of a new friary in Meenen.[3]
In 1608 he became custos in Leuven and the following year first prior of the new foundation in Ypres.[3] He was in the Antwerp house in 1611, in Brussels in 1612, in the Rhineland 1614–1617, and was appointed preacher and confessor in Ghent on 6 July 1617.[2] He died in Brussels on 17 February 1633.[2]