I would want to go with a Gemini Asc. as for the reason he was an actor.
As most astrologers know, Gemini and Aquarius are the two signs that do occur noticeably in the charts of the great thespians.
A birth time of 8:30 am gave Leonard an Asc. in the 8th degree of Gemini. I find that a bit interesting as for the fact that it is the same degree as the Part of Destiny for the chart I ascribe to as being the natal chart of the USA {I'm also a bit taken by the fact his natal Venus was conj. my Moon and his Mercury my Venus} An 8:30 am time also gives a Moon/Mercury quintile, a Moon/Uranus quintile and a Moon/Neptune quintile...but the Moon/Mercury quintile is "the ticket" ...imho.
Now here's what about knocked me out of my chair this morning...
SEPTILES... and there are a bountiful of them.
Check it out Venus/N. Node. Venus/Uranus, Venus/Mercury and if it was apprx 8:30 am, all of the above are in turn Septile to the Asc. {although an Asc. in the 7th deg. of Gemini would really rock this chart}
Marc Edmond Jones called the Septile "an aspect of fatality"
...and it was a Uranus return, right back in Septile aspect to that Asc.
For everyones convenience,
a Septile is 51* 25' 42.8556" or
51* 25' 43"
A Bi-Septile is 102* 51' 25.7112" or
102* 51' 26"
the Tri-Septile is 154* 17' 08.5668' or
154* 17' 09"