On Tuesday, the Mad Men alum helped Duracell launch its new "Stay Connected" initiative, which to bring more attention to the issue of hearing impairment and encourage people to get tested and get a hearing aid if they suffer from loss.
Of his own father Jack Slattery's struggle with his hearing loss, the actor told PEOPLE: "He was disconnected from the every day events in his life and our life."
Slattery and his five siblings, started noticing something wasn't right because they would have to explain things to their father a second time. Eventually, he agreed to get his hearing checked and has been wearing a hearing aid for five years.
"It changed his life," said Slattery, 54. "We get together a lot. We sit at the dinner table. We play cards. Everything is just easier for him."
John Lamparski / WireImage
Slattery made his debut on HBO's Veep on Sunday as Julia Louis-Dreyfus' new love interest Charlie Baird, a Wall Street banker who hits off immediately with President Selina Meyer.
"She's just a brilliant comedian and actress," said Slattery about working with the record-breaking Emmy winner. "I was a huge fan of the show before I went on, and I was glad to be asked. I had a great time."
Veep airs Sundays (10:30 p.m. ET) on HBO.