diff --git a/lib/attribute_normalizer.rb b/lib/attribute_normalizer.rb
index 4bfbe0c..fc3369f 100644
--- a/lib/attribute_normalizer.rb
+++ b/lib/attribute_normalizer.rb
@@ -1,3 +1,4 @@
+require 'attribute_normalizer/normalizers/base_normalizer'
 require 'attribute_normalizer/normalizers/blank_normalizer'
 require 'attribute_normalizer/normalizers/phone_normalizer'
 require 'attribute_normalizer/normalizers/strip_normalizer'
diff --git a/lib/attribute_normalizer/normalizers/base_normalizer.rb b/lib/attribute_normalizer/normalizers/base_normalizer.rb
new file mode 100644
index 0000000..2218aae
--- /dev/null
+++ b/lib/attribute_normalizer/normalizers/base_normalizer.rb
@@ -0,0 +1,16 @@
+module AttributeNormalizer
+  module Normalizers
+    module BaseNormalizer
+      def normalize(value, options = {})
+        case value
+        when String
+          perform_normalization(value)
+        when Array
+          value.map{|v| perform_normalization(v)}
+        else
+          value
+        end
+      end
+    end
+  end
+end
diff --git a/lib/attribute_normalizer/normalizers/blank_normalizer.rb b/lib/attribute_normalizer/normalizers/blank_normalizer.rb
index 8efc668..91a1a57 100644
--- a/lib/attribute_normalizer/normalizers/blank_normalizer.rb
+++ b/lib/attribute_normalizer/normalizers/blank_normalizer.rb
@@ -1,9 +1,16 @@
 module AttributeNormalizer
   module Normalizers
     module BlankNormalizer
+      extend BaseNormalizer
       def self.normalize(value, options = {})
-        value.nil? || (value.is_a?(String) && value !~ /\S/) ? nil : value
+        val = super
+        val.reject!{|v| v.nil?} if val.is_a? Array
+        val
+      end
+
+      def self.perform_normalization(value)
+        value !~ /\S/ ? nil : value
       end
     end
   end
-end
\ No newline at end of file
+end
diff --git a/lib/attribute_normalizer/normalizers/phone_normalizer.rb b/lib/attribute_normalizer/normalizers/phone_normalizer.rb
index 5655efd..e7ed5e9 100644
--- a/lib/attribute_normalizer/normalizers/phone_normalizer.rb
+++ b/lib/attribute_normalizer/normalizers/phone_normalizer.rb
@@ -1,10 +1,12 @@
 module AttributeNormalizer
   module Normalizers
     module PhoneNormalizer
-      def self.normalize(value, options = {})
-        value = value.is_a?(String) ? value.gsub(/[^0-9]+/, '') : value
-        value.is_a?(String) && value.empty? ? nil : value
+      extend BaseNormalizer
+
+      def self.perform_normalization(value)
+        value = value.gsub(/[^0-9]+/, '')
+        value.empty? ? nil : value
       end
     end
   end
-end
\ No newline at end of file
+end
diff --git a/lib/attribute_normalizer/normalizers/squish_normalizer.rb b/lib/attribute_normalizer/normalizers/squish_normalizer.rb
index 8cafbc0..77a2876 100644
--- a/lib/attribute_normalizer/normalizers/squish_normalizer.rb
+++ b/lib/attribute_normalizer/normalizers/squish_normalizer.rb
@@ -1,9 +1,11 @@
 module AttributeNormalizer
   module Normalizers
     module SquishNormalizer
-      def self.normalize(value, options = {})
-        value.is_a?(String) ? value.strip.gsub(/\s+/, ' ') : value
+      extend BaseNormalizer
+
+      def self.perform_normalization(value)
+        value.strip.gsub(/\s+/, ' ')
       end
     end
   end
-end
\ No newline at end of file
+end
diff --git a/lib/attribute_normalizer/normalizers/strip_normalizer.rb b/lib/attribute_normalizer/normalizers/strip_normalizer.rb
index 8c39378..321b9fa 100644
--- a/lib/attribute_normalizer/normalizers/strip_normalizer.rb
+++ b/lib/attribute_normalizer/normalizers/strip_normalizer.rb
@@ -1,9 +1,11 @@
 module AttributeNormalizer
   module Normalizers
     module StripNormalizer
-      def self.normalize(value, options = {})
-        value.is_a?(String) ? value.strip : value
+      extend BaseNormalizer
+
+      def self.perform_normalization(value)
+        value.strip
       end
     end
   end
-end
\ No newline at end of file
+end
diff --git a/lib/attribute_normalizer/normalizers/whitespace_normalizer.rb b/lib/attribute_normalizer/normalizers/whitespace_normalizer.rb
index 49547e6..5b6865b 100644
--- a/lib/attribute_normalizer/normalizers/whitespace_normalizer.rb
+++ b/lib/attribute_normalizer/normalizers/whitespace_normalizer.rb
@@ -1,8 +1,10 @@
 module AttributeNormalizer
   module Normalizers
     module WhitespaceNormalizer
-      def self.normalize(value, options = {})
-        value.is_a?(String) ? value.gsub(/[^\S\n]+/, ' ').gsub(/\s?\n\s?/, "\n").strip : value
+      extend BaseNormalizer
+
+      def self.perform_normalization(value)
+        value.gsub(/[^\S\n]+/, ' ').gsub(/\s?\n\s?/, "\n").strip
       end
     end
   end
diff --git a/spec/article_spec.rb b/spec/article_spec.rb
index b756558..4befb82 100644
--- a/spec/article_spec.rb
+++ b/spec/article_spec.rb
@@ -1,6 +1,7 @@
 require File.dirname(File.expand_path(__FILE__)) + '/test_helper'
 
 describe Article do
+  it { should normalize_attribute(:title).from([' Social Life at the Edge of Chaos    ']).to(['Social Life at the Edge of Chaos']) }
   it { should normalize_attribute(:title).from(' Social Life at the Edge of Chaos    ').to('Social Life at the Edge of Chaos') }
   it { should normalize_attribute(:slug) }
   it { should normalize_attribute(:slug).from(' Social Life at the Edge of Chaos    ').to('social-life-at-the-edge-of-chaos') }
diff --git a/spec/author_spec.rb b/spec/author_spec.rb
index d06b6f7..ed2ffc2 100644
--- a/spec/author_spec.rb
+++ b/spec/author_spec.rb
@@ -11,26 +11,32 @@
     # :strip normalizer
     it { should normalize_attribute(:first_name).from('  this  ').to('this') }
     it { should normalize_attribute(:first_name).from('    ').to('') }
+    it { should normalize_attribute(:first_name).from(['    ', ' ']).to(['', '']) }
 
     # :squish normalizer
     it { should normalize_attribute(:nickname).from(' this    nickname  ').to('this nickname') }
+    it { should normalize_attribute(:nickname).from([' this    nickname  ']).to(['this nickname']) }
 
     # :blank normalizer
     it { should normalize_attribute(:last_name).from('').to(nil) }
     it { should normalize_attribute(:last_name).from('  ').to(nil) }
     it { should normalize_attribute(:last_name).from(' this ').to(' this ') }
+    it { should normalize_attribute(:last_name).from(['  ']).to([]) }
+    it { should normalize_attribute(:last_name).from(['  ', 'two']).to(['two']) }
 
     # :whitespace normalizer
     it { should normalize_attribute(:biography).from("  this    line\nbreak ").to("this line\nbreak") }
     it { should normalize_attribute(:biography).from("\tthis\tline\nbreak ").to("this line\nbreak") }
     it { should normalize_attribute(:biography).from("  \tthis  \tline  \nbreak \t  \nthis").to("this line\nbreak\nthis") }
     it { should normalize_attribute(:biography).from('    ').to('') }
+    it { should normalize_attribute(:biography).from(['    ']).to(['']) }
   end
 
   context 'on default attribute with the default normalizer changed' do
     it { should normalize_attribute(:phone_number).from('no-numbers-here').to(nil) }
     it { should normalize_attribute(:phone_number).from('1.877.987.9875').to('18779879875') }
     it { should normalize_attribute(:phone_number).from('+ 1 (877) 987-9875').to('18779879875') }
+    it { should normalize_attribute(:phone_number).from(['+ 1 (877) 987-9875']).to(['18779879875']) }
   end
 
 end