Gilbert has produced records, notably H2O's Nothing to Prove and A Day to Remember's albums, Homesick, What Separates Me from You and Common Courtesy.

[10] Gilbert married Sherri DuPree of the rock band Eisley in February 2007,[11] and divorced later in the year.

[12] He also married Paramore's lead vocalist and keyboardist Hayley Williams from February 2016[13] until they divorced in 2017[14] due to infidelity on Gilbert's part.

[19] On December 19, 2021, Gilbert reported that he underwent emergency surgery at the ICU to remove a rare cancerous tumor called a pheochromocytoma after he was found unresponsive in his bed at home.

[20] On August 15, 2022, Gilbert reported that he had been diagnosed with cancer again and would undergo surgery the following day after another pheochromocytoma tumor was discovered in his spine.