Mr. Mueller's birth hour seems to be unknown but his birth date shows a dramatic Leo Sun and either Moon in the last decan of Pisces or in Aries. Luna's range on that day (August 7, 1944 NYC) is from 21Pis29 to 6Ari18; the Sun's range: 14Leo30 to 15Leo27. His Moon is ruled by either Jupiter (co-ruled by Neptune: secretive Pisces) or by activist Mars, ruler of pioneering Aries.
(Personally I'm leaning toward a Pisces Moon for several reasons, not the least of which is that the Sun Leo-Moon Pisces blend is that of a very famous spy born under its sway: Mata Hari! A Leo-Aries double Fire personality blend is a volatile combination and unless he's explosive in private, this doesn't seem to fit him, imho. On his day of birth, the Moon conjoined the Aries Point at 1:43:10 pm which gives him a good chance of a Pisces Moon--too compassionate to lead the Bureau? Perhaps. But oh so secretive!)
Now since a birth hour is unnecessary for determining Robert Mueller's Prenatal Solar Eclipse, we know that his 'cosmic blink' occurred on July 20, 1944 @27Cancer, a degree opposite US natal Pluto Rx, a powerful undercover/underworld planet often associated with spies, surveillance, stealth, manipulation, control, and extreme wealth.
In fact, Mr. Mueller's PE in the 19 North Saros Series has recently repeated--on September 1, 2016 @9Virgo and is the PE of both the November 8, 2016 Election and the 2017 Inauguration of Donald "Fake News" Trump with its themes of: realism, coming down to earth, becoming aware of an old situation and seeing it for what it really is, and constructive truth tackling (Brady's Predictive Astrology). As you may have noticed, Mr. Trump makes up his own truths, lives in an imaginary world where he never makes mistakes (!), and where his Libran Jupiter often pouts that it "isn't fair" that people dare to criticize ("mistreat") him!
So even though yours truly is no fan of the Deep State and its political and media representatives now working 24/7 to undermine the Trump presidency, my hope for our nation's sake is that Special Counsel Mueller will be able to tackle the truth about the several compromising conditions America now faces thanks to the unsuitable, amateurish presidency of the dictator-loving, Mercury-Neptune-squared, indiscreet Mr. Trump, our very own Eclipse Baby whining and sulking in the Oval.
Coming Soon: June 9, 2017: Jupiter Stations Direct at the Sag Full Moon. Then on August 7, 2017 a Lunar Eclipse perfects @15AQ, as noted in opposition to Mr. Mueller's natal Sun in mid-Leo which may or may not be significant for him and/or for the investigation.
As we've previously discussed, 19 North is also the PE of Trump's adviser and son-in-law Jared Kushner...and is the PE of the FBI! No wonder Robert Mueller remains popular at the agency--the Bureau and the former Director are cosmically in-sync.
If you wish to look ahead, here's a list of the 2018 Lunar and Solar Eclipses with Themes.