Bart van der Leck Bart van der Leck Bart van der Leck (26 November 1876, Utrecht – 13 November 1958, Blaricum) was a Dutch painter, designer, and ceramicist. With Theo van Doesburg and Piet Mondrian he founded the De Stijl art movement. Son of a house painter, he started his career learning how to make stained glass in a shop in Utrecht. An example of his later stained glass work is in the Kröller-Müller Museum in Hoge Veluwe, Netherlands. After having met Mondrian and van Doesburg and having founded the Stijl movement with them, his style became completely abstract, as did Mondrian's. But after
Guido van Rossum Java. According to a programming language popularity survey it is consistently amongst the top 10 most mentioned languages in job postings. Furthermore, Python is consistently in the top 10 most popular languages according to the TIOBE Programming Community Index. At Google, Van Rossum developed Mondrian, a web-based code review system written in Python and used within the company. He named the software after the Dutch painter Piet Mondriaan. He named another related software project after Gerrit Rietveld, a Dutch designer. In 2013, Van Rossum started working at the cloud file storage company Dropbox. Guido van Rossum Guido van Rossum (;