Action Alerts Plus holding Goldman Sachs Group Inc. (GS) could soon be in the market for a new CEO.

Current CEO Lloyd Blankfein is expected to step down from his top position as soon as the end of this year, according to a report in The Wall Street Journal, which cited anonymous sources familiar with the matter.

Blankfein led Goldman for more than 12 years, making him one of the longest-serving heads of a Wall Street investment bank. In the time that Blankfein has led Goldman he's done quite a lot -- from fielding criticism post-recession to offering relatively outspoken market commentary.

Here are some of Blankfein's best tweets since he joined Twitter in June 2011.

Blankfein the Philosopher:

Lincoln: "A house divided against itself cannot stand." Isolate those who try to separate us. No equivalence w/ those who bring us together.

— Lloyd Blankfein (@lloydblankfein) August 14, 2017

Wish the moon wasn't the only thing casting a shadow across the country. We got through one, we'll get through the other. #SolarEclipse2017

— Lloyd Blankfein (@lloydblankfein) August 21, 2017

View from our building today reminds me that despite all the sh*t, American values will shine through. pic.twitter.com/b3f6W80XX9

— Lloyd Blankfein (@lloydblankfein) January 12, 2018

Blankfein the Jokester:

#TBT Summer's over; back to school! pic.twitter.com/4d7uXrKDeA

— Lloyd Blankfein (@lloydblankfein) September 7, 2017

And they say I don't know jack! pic.twitter.com/RkKgJdjnb0

— Lloyd Blankfein (@lloydblankfein) December 13, 2017

Blankfein the Markets Analyst:

Still thinking about #Bitcoin. No conclusion - not endorsing/rejecting. Know that folks also were skeptical when paper money displaced gold.

— Lloyd Blankfein (@lloydblankfein) October 3, 2017

#Brexit decision belongs to UK citizens, and I'm not one. But GS built its Euro biz in the UK on certain assumptions, pays taxes and employs thousands of UK citizens concerned about the economy and their futures. On their behalf, at least, I have to be interested in the outcome. https://t.co/CteE8Kjayo

— Lloyd Blankfein (@lloydblankfein) December 17, 2017
Give Trump credit for campaigning where there are no electoral votes. His message at #Davos: promoting America's interests doesn't mean withdrawing from the world. Agreed. Now can we stick with international commitments on environment, trade, defense? — Lloyd Blankfein (@lloydblankfein) January 26, 2018

Hearing bipartisan support forming on #DACA. The country and the kids need it, deserve it. Hope it's not just a dream...

— Lloyd Blankfein (@lloydblankfein) January 12, 2018

And finally, in his most recent tweet, Blankfein offered a round of applause for Gary Cohn, who once served as his understudy at Goldman, following his decision to exit his role as President Donald Trump's top economic adviser.

Gary Cohn deserves credit for serving his country in a first class way. I'm sure I join many others who are disappointed to see him leave.

— Lloyd Blankfein (@lloydblankfein) March 6, 2018