Everyone. That is, everyone interested in mechanics and mechanicians. This includes students, academics, practitioners, publishers, managers in funding agencies, and enthusiasts.  iMechanica is free:  writers are free to post, and readers are free to read. 

Registering takes less than 1 minute. All you need is your name and your email address.  Within 2 minutes, you should have posted your first entry. Posting an entry is similar to sending an email: all you need is a title and a body of text. The rest is optional.