Gotham with Mercury in action on mountvernon.org

• .header-1 { font-family: 'Gotham SSm A', 'Gotham SSm B', Helvetica, sans-serif; font-size: 36px; font-style: normal; font-weight: 600; letter-spacing: normal; line-height: normal; text-transform: none; color: #36302A; }
• .header-2 { font-family: 'Gotham SSm A', 'Gotham SSm B', Helvetica, sans-serif; font-size: 24px; font-style: normal; font-weight: 600; letter-spacing: normal; line-height: normal; text-transform: none; color: #36302A; }
• .content-1 { font-family: 'Mercury Text G1 A', 'Mercury Text G1 B', Georgia, serif; font-size: 20px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 32px; text-transform: none; color: #645F5A; }
• .content-2 { font-family: 'Mercury Text G1 A', 'Mercury Text G1 B', Georgia, serif; font-size: 20px; font-style: italic; font-weight: normal; letter-spacing: normal; line-height: 32px; text-transform: none; color: #645F5A; }

Mercury is available from Fonts.com and MyFonts.