Peter Suber (the author of the website) is the “Director of the Harvard Open Access Project, Faculty Fellow at the Berkman Center for Internet & Society, Senior Researcher at SPARC, Open Access Project Director at Public Knowledge, and Research Professor of Philosophy at Earlham College” (Suber). He also wrote a book about Open Access. To find his credentials are not hard because he provides a link to his biography. The fact that he provides that information for the reader establishes ethos with his audience. It is clear from his biography that his stance on the issue is to support Open Access. He first published the website on December 29, 2004, so it’s a bit outdated. He does not cite any other sources, but I don’t think he needs to because he is an expert on the subject.
Unlike the other source, Stevan Harnad does not provide information about himself. However, after doing some research, I found out that he is a “Professor in the Department of Psychology at Université du Québec à Montréal, [holds] the Canada Research Chair in Cognitive Sciences and is also Affiliate Professor in Electronics and Computer Science at University of Southampton, UK” (http://www.ecs.soton.ac.uk/people/harnad). He wrote many books on Open Access – most of which were collaborations. It is clear from his background information that he opinion is well respected for supporting Open Access. Also unlike the other source, his article was published between 2011-2012 so it is more current. He did not cite any other sources mainly because he is the one other sources cite.