diff --git a/src/main/scala/bigquery4s/BigQuery.scala b/src/main/scala/bigquery4s/BigQuery.scala
index 9400123..50da2b9 100644
--- a/src/main/scala/bigquery4s/BigQuery.scala
+++ b/src/main/scala/bigquery4s/BigQuery.scala
@@ -1,6 +1,6 @@
 package bigquery4s
 
-import java.io.{ File, InputStreamReader, FileInputStream }
+import java.io.{ File, InputStream, InputStreamReader, FileInputStream }
 
 import com.google.api.client.auth.oauth2.Credential
 import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp
@@ -162,4 +162,18 @@ object BigQuery {
     BigQuery(transport, jsonFactory, credential)
   }
 
+  def fromServiceAccountJsonInputStream(
+    serviceAccountJsonInputStream: InputStream,
+    transport: HttpTransport = new NetHttpTransport,
+    jsonFactory: JsonFactory = new JacksonFactory,
+    scopes: Seq[String] = Seq(BigqueryScopes.BIGQUERY)
+  ): BigQuery = {
+
+    val credential = using(serviceAccountJsonInputStream) { in =>
+      GoogleCredential.fromStream(in).createScoped(scopes.asJava)
+    }
+
+    BigQuery(transport, jsonFactory, credential)
+  }
+
 }
\ No newline at end of file
diff --git a/src/test/scala/bigquery4s/ServiceAccountUsageExamplesSpec.scala b/src/test/scala/bigquery4s/ServiceAccountUsageExamplesSpec.scala
new file mode 100644
index 0000000..44db298
--- /dev/null
+++ b/src/test/scala/bigquery4s/ServiceAccountUsageExamplesSpec.scala
@@ -0,0 +1,77 @@
+package bigquery4s
+
+import java.io.FileInputStream
+
+import org.scalatest._
+import org.slf4j.LoggerFactory
+
+/**
+ * requirement: $HOME/.bigquery/service_account.json
+ */
+class ServiceAccountUsageExamplesSpec extends FunSpec with Matchers {
+
+  lazy val logger = LoggerFactory.getLogger(classOf[UsageExamplesSpec])
+  val yourOwnProjectId = "thinking-digit-98014"
+
+  describe("Simple query example with publicdata using service account json file") {
+    it("runs") {
+      val bq = BigQuery.fromServiceAccountJson()
+
+      val datasets: Seq[WrappedDatasets] = bq.listDatasets("publicdata")
+      logger.info(datasets.mkString("\n"))
+
+      val query = """
+        SELECT weight_pounds,state,year,gestation_weeks FROM publicdata:samples.natality
+        ORDER BY weight_pounds DESC LIMIT 100;
+      """
+      val jobId: JobId = bq.startQuery(yourOwnProjectId, query)
+      logger.info(s"JobId: $jobId")
+
+      val job: WrappedCompletedJob = bq.await(jobId)
+      logger.info(s"Job: $job")
+
+      val rows: Seq[WrappedTableRow] = bq.getRows(job)
+      val sampleCsv = rows.take(20).map(_.cells.map(_.value.orNull).mkString(","))
+      logger.info(s"""
+                     |*** QueryResult ***
+                     |
+       |weight_pounds,state,year,gestation_weeks
+                     |${sampleCsv.mkString("\n")}
+                     |""".stripMargin)
+    }
+  }
+
+  describe("Simple query example with publicdata using service account json string") {
+    it("runs") {
+      using(new FileInputStream(homeDir + "/.bigquery/service_account.json")) { in =>
+        val bq = BigQuery.fromServiceAccountJsonInputStream(in)
+
+        val datasets: Seq[WrappedDatasets] = bq.listDatasets("publicdata")
+        logger.info(datasets.mkString("\n"))
+
+        val query =
+          """
+          SELECT weight_pounds,state,year,gestation_weeks FROM publicdata:samples.natality
+          ORDER BY weight_pounds DESC LIMIT 100;
+        """
+        val jobId: JobId = bq.startQuery(yourOwnProjectId, query)
+        logger.info(s"JobId: $jobId")
+
+        val job: WrappedCompletedJob = bq.await(jobId)
+        logger.info(s"Job: $job")
+
+        val rows: Seq[WrappedTableRow] = bq.getRows(job)
+        val sampleCsv = rows.take(20).map(_.cells.map(_.value.orNull).mkString(","))
+        logger.info(s"""
+                       |*** QueryResult ***
+                       |
+         |weight_pounds,state,year,gestation_weeks
+                       |${
+          sampleCsv.
+            mkString("\n")
+        }
+                       |""".stripMargin)
+      }
+    }
+  }
+}