diff --git a/prereqs_mac.sh b/prereqs_mac.sh
index d2d0ce5d..5b3cb262 100755
--- a/prereqs_mac.sh
+++ b/prereqs_mac.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
 
+# homebrew
 which -s brew
 if [[ $? != 0 ]] ; then
     # Install Homebrew
@@ -9,18 +10,32 @@ else
     brew update
 fi
 
-# TODO: We want to check if user has python already installed.
-# In-case if they have some other version of python installed, 
-# this will create yet another installation.
-
-# echo "Downloading and installing Python3 using homebrew"
-# brew install python3
+# python 3
+echo "Checking for python3 installation"
+if command -v python3 &>/dev/null; then
+    echo "Python 3 already installed"
+else
+    echo "Downloading and installing Python3 using homebrew"
+    brew install python3
+fi
 
-# checking for bazel
-echo "Downloading and installing Bazel using homebrew"
-brew tap bazelbuild/tap
-brew install bazelbuild/tap/bazel
+# bazel
+if command -v bazel &>/dev/null; then
+    echo "Bazel already installed"
+else
+    echo "Downloading and installing Bazel using homebrew"
+    brew tap bazelbuild/tap
+    brew install bazelbuild/tap/bazel
+fi
 
+# pipenv
+echo "Checking for pipenv"
+if python3 -c "import pipenv" &> /dev/null; then
+    echo "pipenv is already installed"
+else
+    echo "installing pipenv"
+    pip3 install pipenv
+fi
 
 # Downloading the Google DP library
 git submodule update --init --recursive