diff --git a/js/util/ExponentialReExpressClosure.js b/js/util/ExponentialReExpressClosure.js
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+++ b/js/util/ExponentialReExpressClosure.js
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+/**
+ * @author: Jeff Thompson
+ * See COPYING for copyright and distribution information.
+ * This is the closure class for use in expressInterest to re express with exponential falloff.
+ */
+
+/*
+ * Create a new ExponentialReExpressClosure where upcall responds to UPCALL_INTEREST_TIMED_OUT
+ *   by expressing the interest again with double the interestLifetime. If the interesLifetime goes
+ *   over maxInterestLifetime, then call callerClosure.upcall with UPCALL_INTEREST_TIMED_OUT.
+ * When upcall is not UPCALL_INTEREST_TIMED_OUT, just call callerClosure.upcall.
+ * 
+ * settings is an associative array with the following defaults:
+ * {
+ *   maxInterestLifetime: 16000 // milliseconds
+ * }
+ */
+var ExponentialReExpressClosure = function ExponentialReExpressClosure
+        (callerClosure, settings) {
+    // Inherit from Closure.
+    Closure.call(this);
+    
+    this.callerClosure = callerClosure;
+    settings = (settings || {});
+	this.maxInterestLifetime = (settings.maxInterestLifetime || 16000);
+};
+
+ExponentialReExpressClosure.prototype.upcall = function(kind, upcallInfo) {
+    try {
+        if (kind == Closure.UPCALL_INTEREST_TIMED_OUT) {
+            var interestLifetime = upcallInfo.interest.interestLifetime;
+            if (interestLifetime == null)
+                return this.callerClosure.upcall(Closure.UPCALL_INTEREST_TIMED_OUT, upcallInfo);
+            
+            var nextInterestLifetime = interestLifetime * 2;
+            if (nextInterestLifetime > this.maxInterestLifetime)
+                return this.callerClosure.upcall(Closure.UPCALL_INTEREST_TIMED_OUT, upcallInfo);
+            
+            var nextInterest = upcallInfo.interest.clone();
+            nextInterest.interestLifetime = nextInterestLifetime;
+            upcallInfo.ndn.expressInterest(nextInterest.name, this, nextInterest);
+            return Closure.RESULT_OK;
+        }  
+        else
+            return this.callerClosure.upcall(kind, upcallInfo);
+    } catch (ex) {
+        console.log("ExponentialReExpressClosure.upcall exception: " + ex);
+        return Closure.RESULT_ERR;
+    }
+};