familiar to, familiar with

Familiar to means known to. If someone or something is familiar to you, you recognize it well.

• His work is familiar to me.
• Her face is familiar to the crowd.
• This tune is familiar to most of the singers.
• The appearance of the Polar bear is familiar to all.
• The name of the school was not familiar to me.

Familiar with means having a fairly good knowledge of. If you are familiar with something, you know or understand it well.

• He is familiar with the countryside.
• Sam was familiar with those streets.
• Eva is quite familiar with Central Television; she worked there for 5 years.
• I'm familiar with various teaching software packages.
• I’m not familiar with the latest research in this field.