Prof McCarthy is the username for J. Michael McCarthy, Distinguished Professor in the Department of Mechanical and Aerospace Engineering in the Henry Samueli School of Engineering of the University of California, Irvine. He is the former Director of the Performance Engineering Program in the Department of Mechanical and Aerospace Engineering and is the past Henry Samueli Professor and Director of the Center for Engineering Science in Design.
Please see mechanicaldesign101.com where I collect resources for education in mechanical design. I have also found GeoGebra to be an excellent tool for illustrating the geometric properties of linkages. Link to Geogebra worksheets that I have prepared are available on my GeoGebra profile page. You also may find my YouTube channel mechanical design 101 to be of some interest.
My students regularly use Wikipedia for an introduction to topics in machines and mechanisms, and Wikipedia is often the first entry in a Google search on these topics, which means that many others rely on it as well. For this reason, I now take the time to edit articles on machines so they match more closely to our current understanding, while being respectful of the contributions of others.
This effort has brought me into contact with a number of diligent individuals in the Wikipedia community. It is clear, that as with many things, the true strength of an organization is the quality and commitment of the individuals who support it.