When was the last time you thought about the font you used in that memo or brief—perhaps making a quick check of the local rules? Well, if you are Matthew Butterick, typography is not an afterthought—it’s a main idea, perhaps an obsession. While working as an attorney in Los Angeles, Butterick started the blog “Typography for Lawyers,” some of which was published by Jones McClure as a book of the same name. In addition to designing font families – he graduated from Harvard with a major in art – Butterick recently has released a Web-based book, Butterick’s Practical Typography, offering pointers on point size, line spacing, height, and yes, whether you should ever use Times New Roman. (You shouldn’t.)