I came across a 2012 article posted by the American Academy of Microbiology. It is an FAQ (Frequently Asked Questions) on yeast titled, If the Yeast ain’t happy, ain’t nobody happy. And, far from being written in obfuscating sciency prose, it is written down-to-earth language even I can understand. This is not to say that it is not science-based.
FAQ reports [by the American Academy of Microbiology] are based on the deliberations of 15-20 expert scientists who gather for a day to develop science-based answers to questions the public might have about topics in microbiology. The reports are reviewed by all participants, and by outside experts, and every effort is made to ensure that the information is accurate and complete.
It is chockablock full of good information on brewers yeast, party because the Pope of Foam, Charles Bamforth, Ph.D., D.Sc. of University of California Davis Department of Food Science and Technology; Chris White, Ph.D., of White Labs; and Katherine Smart, Ph.D. of SABMiller are on the steering committee.
Here is the link to the PDF: http://academy.asm.org/images/stories/documents/ColloquiaDoc/faq_beer.pdf