Person

{
  "@context": "https://schema.org",
  "@type":"Person",
    "name":"The name of person",
    "email": "mailto:zzzbb@gmail.com",
    "image":{
     "@type":"ImageObject",
        "url":"https://ex.com/img/foto.jpg",
        "contentUrl":"https://ex.com/img/foto.jpg",
        "width":"481",
        "height":"438",
        "thumbnail":{
          "@type":"ImageObject",
          "url":"https://ex.com/img/foto-m.jpg",
          "contentUrl":"https://ex.com/img/foto-m.jpg",
          "width":"300",
          "height":"273"
        }
    },
    "jobTitle":"Expert of digital marketing",
    "url":"https://ex.com/aboutme.html", 
     "sameAs": [
       "https://plus.google.com/111008877",
       "https://twitter.com/nik",
       "https://www.linkedin.com/in/zzz-665577"
       ],
     "alumniOf":{
       "@type":"EducationalOrganization",
       "name":"Google Digital Garage",
       "sameAs":"https://learndigital.withgoogle.com/digitalgarage",
       "alumni":
        {
         "@type":"Person",
         "name": "Nikolaj Antonov",
          "award":"The certificate of Google Digital Garage of the Fundamentals of Digital Marketing",
          "image":{
          "@type":"ImageObject",
            "about":{
           "@type":"DigitalDocument",
             "image":[
               "https://nikantmark.com/img/marketingcert1300.jpg",
               "https://nikantmark.com/img/marketingcert1000.jpg",
               "https://nikantmark.com/img/marketingcert800.jpg",
               "https://nikantmark.com/img/marketingcert500.jpg",
               "https://nikantmark.com/img/marketingcert300.jpg"
            ]
         }} 
       }
      },
     "brand":{
      "@type":"Organization",
       "legalName":"The legal name",
       "url":"https://ex.com/"
     },
     "award":[
       "The award",
       "The award",
       "The award"
       ],
       "knowsLanguage":[{
        "@type":"Language",
         "name":"Russian",
         "alternateName":"ru",
         "additionalType":"http://www.productontology.org/id/Russian_language"
        },
        {
        "@type":"Language",
         "name":"Swedish",
         "alternateName":"sv",
         "additionalType":"http://www.productontology.org/id/Swedish_language"
        },
        {
        "@type":"Language",
         "name":"English",
         "alternateName":"en",
         "additionalType":"http://www.productontology.org/id/English_language"
        }],
       "knowsAbout":{
        "@type":"Thing",
         "name":[
          "HTML5",
          "CSS",
          "Digital marketing",
          "Search_engine_optimization (SEO)",
          "Local search engine optimisation",
          "Social media optimization (SMO)"
          ],
          "additionalType":
          [
           "http://www.productontology.org/id/HTML5",
           "http://www.productontology.org/id/Cascading_Style_Sheets",
           "http://www.productontology.org/id/Digital_marketing",
           "http://www.productontology.org/id/Search_engine_optimization",
           "http://www.productontology.org/id/Local_search_engine_optimisation",
           "http://www.productontology.org/id/Social_media_optimization"
          ]
        },
        "memberOf":[{
         "@type":"ProgramMembership",
          "programName":"The Program Membership",
          "membershipNumber":"332211",
          "url":"https://prog.html"
        },
        {
         "@type":"ProgramMembership",
          "programName":"The Program Membership",
          "membershipNumber":"112233",
          "url":"https://prog2.html"
        },
        {
         "@type":"Organization",
          "legalName":"The legal name",
          "url":"https://prog3.html"
        }]
    }