Author name and contact method should go directly below the help block in the header of each m-file. Be sure to separate it from the help block with a blank line without "%" so that it doesn't appear when the help block is displayed using the help command.
If desired, include in this same section affiliations and/or copyright information.
References may be included in the same comment block as the author contact information if necessary.
If this makes the comment block too long, move the whole author and references block to the end of the file (before revision history) or use a block comment (%{ ... %}) so viewers can collapse the block. Give the block comment a heading so users know what it is when it's collapsed.