@2mkgz Is it possible to find periods of absence using SEDE? Or is the only way to have a look at activity tab and see how long gap is there?

For this particular user I see that he answered question on 2015-05-01. Before that there are edits and comments on 2013-06-23 and 2013-06-22, and an answer on 2013-06-02.

BTW it is the user previously known as J.M. (Or Ｊ. Ｍ. to be more precise.)

web.archive.org/web/%2A/http://math.stackexchange.com/users/498

@MartinSleziak Yes, it's possible: How to find the users who took a long break from posting on an SE site?

Reputation league for April: 1. Brian M. Scott; 2. Hagen von Eitzen; 3. Jack D'Aurizio. Brian and Jack were among the top 3 last month, too.

This years ranking after April: 1. Brian M. Scott; 2. Jack D'Aurizio; 3. kobe. (No changes there.)

@MartinSleziak what type of font is that

@quid I simply copied it from his profile page. (From the version archived in Internet Archive - see the link above.)

It was mentioned several times, that there were big difficulties pinging him.

@quid Not a font, but not the usual characters. "Ｊ" is U+FF2A FULLWIDTH LATIN CAPITAL LETTER J, while "Ｍ" is, unsurprisingly now, ‎U+FF2D FULLWIDTH LATIN CAPITAL LETTER M. (The full-stops and the space are normal, however.)

Thanks for the replies @MartinSleziak and @ArthurFischer