There are a lot of misconceptions about the autism spectrum here. One is that autistic people don't desire social contact. That's not at all true. However, autistic people learn early in life that non-autistic people shy away from them because they don't seem to understand or react appropriately to social cues, nor do they understand humor, especially humor conveyed by timing, vocal expression and facial expression. Therefore, autistic people tend to self-isolate. What comes naturally to most humans CAN be taught, but it will never be reflexive - it will always have to be filtered through conscious analysis. In other words, if most humans see another human approaching with a big smile, they will respond instantly with a smile or a small wave. Instead, even the most high-functioning autistic person will have to go through an analytic process - "that person is smiling at me. That means that that person is friendly and non-threatening. I can smile back". That faster that this process takes place, the more convincing job the autistic person will do at fooling the people around him this his response is spontaneous. Temple Grandin says that the miracle of human beings is that they continue to learn and grown throughout life. (She is a very well-known author about this topic, being autistic herself). Autistic people can come closer and closer to reading and reacting to other people the longer they live, as long as they are willing to invest the time and energy to learning how to do what is instinctive to others.
Sorry to the person above who says that most self-proclaimed autistic people are just socially awkward as he is himself. Sorry, Mr. , but you ARE autistic if you are socially awkward. What do we mean when we say that someone is socially awkward?. We mean, a person who doesn't respond appropriately to greetings, to humor, whose voice is always too loud or too soft for the social context, the person who leaps in with an answer to a joke, where the timing is part of the punchline, the person who cannot ever find a way to comfort another person in distress, or who can't comprehend why a person might be in distress, or who always laughs at a joke 30 seconds after everyone else has laughed at it. There are also painfully shy people, but most people recognize easily the difference in someone who is shy vs. someone who is socially awkward.
There are certain red-flags in recognizing autism spectrum people. One is single-minded focus never broken by distraction. Another is obsession with a very narrow subject field where their knowledge will be exhaustive. Baseball statistics, airplane models, plant names, memorizing every Barbra Streisand album, the year it came out, and what songs are on it. (Substitute any other artist).
As a musician, I meet many autistic people in my profession. There are many in the sciences, many many many in the STEM fields, plenty in academia. Who cares? They are all just trying to get through life the best they can.