Thanks Sanford! I'm now having an issue with sorting. I'm using..
#set( $sortedList = $sorter.sort( $OpportunityList,["createdAt:desc"]) )
but it keeps returning the first Opportunity (null).
{HP_Payment_Protect__c=null, MarketoCreatedAt=2017-02-20 23:03:50}
{HP_Payment_Protect__c=null, MarketoCreatedAt=2017-02-20 23:17:48}
{HP_Payment_Protect__c=1, MarketoCreatedAt=2017-02-20 23:25:11}
{HP_Payment_Protect__c=null, MarketoCreatedAt=2017-09-27 03:22:52}
{HP_Payment_Protect__c=0, MarketoCreatedAt=2017-09-27 19:08:46}
{HP_Payment_Protect__c=null, MarketoCreatedAt=2018-10-25 00:56:11}
{HP_Payment_Protect__c=null, MarketoCreatedAt=2018-12-14 14:10:35}
{HP_Payment_Protect__c=null, MarketoCreatedAt=2018-12-14 14:48:17}
{HP_Payment_Protect__c=1, MarketoCreatedAt=2018-12-14 15:09:51}
{HP_Payment_Protect__c=1, MarketoCreatedAt=2019-09-05 03:23:26}
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