I suggest you reverse the order, to announce he’s joining the board first, then give some background on who he is.

For example:

Twitter:

Welcome @GuyKawasaki to our Board of Trustees! Guy is a noted author and entrepreneur who brings unique experience to our movement.
https://blog.wikimedia.org/2015/03/24/guy-kawasaki-joins-wikimedia-board/


Facebook/Google+:

We’re pleased to welcome Guy Kawasaki to our Board of Trustees! Guy is a noted author, entrepreneur and internet evangelist, who will bring unique experience and perspective to our movement.
https://blog.wikimedia.org/2015/03/24/guy-kawasaki-joins-wikimedia-board/

-f


On Mar 24, 2015, at 11:19 AM, Michael Guss <mguss@wikimedia.org> wrote:

I like the second tweet; I'd tweak to say @Wikimedia Foundation Board of Trustees

I'd cut " a new board member...." and just start with " We are pleased to announce our newest addition to the Wikimedia Foundation Board of Trustees, Guy Kawaski."

On Tue, Mar 24, 2015 at 10:50 AM, Andrew Sherman <asherman@wikimedia.org> wrote:
Hello everyone,

We published "Wikimedia Foundation welcomes Guy Kawasaki as board member" to the blog. URL:


Thanks to Jan-Bart De Vreede for writing the draft and everyone else for helping to edit.

Below are some proposed social media messages. Please tweak as needed

Twitter

Introducing our new board member @GuyKawasaki.  

Noted entrepreneur, writer, and Chief evangelist of @canva -- Please welcome @GuyKawasaki to the board of trustees.

Facebook/Google+

A new board member has joined the Wikimedia ranks. Welcome (https://en.wikipedia.org/wiki/Guy_Kawasaki)Guy Kawasaki, entrepreneur, writer, and speaker.

Thanks,

--
Andrew Sherman
Digital Communications | Wikimedia Foundation

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--
Michael Guss
Research Analyst
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