Whitney in action on frontapp.com

• .header-1 { font-family: "Whitney SSm A", "Whitney SSm B", Whitney, "Helvetica Neue", sans-serif; font-size: 30px; font-style: normal; font-weight: 400; letter-spacing: normal; line-height: 45px; text-transform: none; color: #4D4F51; }
• .header-2 { font-family: "Whitney SSm A", "Whitney SSm B", Whitney, "Helvetica Neue", sans-serif; font-size: 16px; font-style: normal; font-weight: 600; letter-spacing: 0px; line-height: 25px; text-transform: uppercase; color: #4D4F51; }
• .content-1 { font-family: "Whitney SSm A", "Whitney SSm B", Whitney, "Helvetica Neue", sans-serif; font-size: 15px; font-style: normal; font-weight: 400; letter-spacing: normal; line-height: 24px; text-transform: none; color: #6F7175; }

Whitney is available from MyFonts.