If you would like to get someone's professional details online then you will have to know which websites to refer to for the same. Several website types exist that can provide you with information about people. However your chances would be improved if you can refer to social media websites like LinkedIn and Facebook. These tend to have profiles of people that belong to different professions.
The best way however would be to use Google to search someone's details so that you can get links to relevant websites that will have information about the person you may be looking for. As an example, you can search for someone named Dr. Ahmed Omarjee on Google.
Among the various web pages that you will find listed on Google as a result of your search, you will find https://www.linkedin.com/in/ahmed-omarjee-26a4aa2b to be one of the profiles on a social media site that has further information about Doctor Ahmed Omarjee. In order to access further details about anyone with a profile on LinkedIn, you will require to create an account for yourself first.
This is because you will not be able to check out people's profiles on LinkedIn or similar other social media sites without first creating an account yourself. When you go through someone's profile on LinkedIn, they get informed about it through one of the notification settings that they may have activated on their accounts.