import pandas as pd

employees = {
    "bdoe@email.com": {
        "first_name": "Bob", 
        "last_name": "Doe",
        "address": {
            "city": "New York",
            "street": "1st Street",
            "house_number": 1
        }
    },
    "mmarkson@email.com": {
        "first_name": "Mark", 
        "last_name": "Markson",
        "address": {
            "city": "San Diego",
            "street": "2nd Street",
            "house_number": 2
        }
    }
}

pd.DataFrame(employees)