Steve Jobs was famous -- even infamous -- for keeping Apple's best secrets closely guarded, but it turns out he kept his private life even more shrouded in mystery.

While many feel a personal loss with the passing of the tech legend, few know much about his life outside of business. In fact, a 2010 CBS poll found that 69 percent of Americans didn't know enough about him to have a real opinion. In the wake of his death, however, more details have emerged about his highly secretive private life.

For instance, Jobs refused to speak with his biological father. In turn, Jobs' father, Abdulfattah "John" Jandali, reportedly never had the chance to say goodbye to his son.

The 80-year-old vice president at Boomtown Hotel Casino in Reno, Nev. apparently tried to reach out to his son via email prior to his death, but never received a response, according to ABC News. The two have long been estranged, as Jobs reportedly refused to speak to his biological dad for some time.

From "Good Morning America":

Abdulfattah "John" Jandali, a Syrian man who fathered Jobs, had emailed his son a few times in a tentative effort to make contact. The father never called the son because he feared Jobs would think the dad who had given him up was now after his fortune.

And Jobs never responded to his father's emails.

According to USA Today, the Apple visionary's father has declined to comment on his son's death.

"I really don't have anything to say," Jandali told the Reno Journal-Gazette.

Due to Jandali's reluctance to publicly address Jobs' death, it's unclear whether or not there was any communication between the two during Jobs' final days.

Jandali recently came into the public spotlight following his son's resignation as CEO of Apple. With much speculation on the state of Jobs' health at the time, many media outlets began tracking down the casino executive for interviews, according to the Las Vegas Sun.

Oddly enough, as ABC points out, Jobs' initial refusal to acknowledge his own daughter, Lisa, with his former high school girlfriend seemed unfortunate in the face of his own relationship with his father. However, Jobs did eventually accept paternity of his daughter.

Aside from Lisa, Jobs had a family, which was perhaps the most the most public part of his private life. He and his wife, Laurene Powell were married in a Buddhist ceremony at Yosemite State Park in 1991. They had three children: Reed Paul, Erin Sienna, and Eve.

But few know that Jobs dated singer/songwriter Joan Baez in college as well. That relationship, which is discussed in the biography,"The Second Coming of Steve Jobs," was confirmed by a a friend of Baez, according to ABC. Jobs may have also dated a number of other celebrity women, prior to his marriage.

Aside from his family, few even know about Jobs' background. Like Mark Zuckerberg and other visionaries, Jobs was actually a college dropout, but didn't quite leave for the same reasons. He dropped out of Reed College in Oregon after one semester with little guidance, frequently switched jobs, and even backpacked around India, according to CNN.

The Apple co-founder's private life is sure to gain more attention in the coming months, with the impending release of his authorized biography on October 24. Details of his life to be contained in the book still have not been disclosed by the publisher.