The author of this source is Emma Haruka Iwao, a developer advocate working at Google. She discovered a strong interest in Pi at a young age and moved on the pursue a degree in computer science at the University of Tsukuba for which she received recognition for demonstrating excellence in the field. She broke the record for the most accurate Pi calculation by calculating it to 31.4 trillion digits. This source is a personal blog post describing her method published on Google Cloud. The information in the source can be independently verified through several other news sources. The source was published on March 14, 2019 which coincided with the day that these results were made public. The target audience of this blog post are readers with an interest in mathematics as she offers insight into her specific methodology and processes. The source is comprised of both fact and opinion -- Iwao offers her own thoughts on the subject matter while also presenting factual information in regards to the calcuation.