Graham is set to join the agency in the newly created role as head of digital and media later this month after more than seven years at the banking giant.
Tony Langham, Lansons co-founder and CEO, said a key requirement of the job was "experience in helping blue chip companies achieve meaningful engagement online", adding:
"Russell’s big brand financial services experience speaks directly to Lansons’ strategy of thoughtful senior-level counsel."
Most recently Santander’s group communications manager, social and digital, Graham rose through the ranks having initially joined as e-marketing manager.
He said: "There continues to be a huge opportunity for brands that are able to successfully marry the power of digital with their existing communications strategy, but for those companies that operate within complex regulated markets, digital can be a challenging channel to establish and successfully manage.
"Businesses in these areas, whether they are financial services or not, need a thoughtful approach to digital and social, working with an agency that understands their business and the issues that surround them. I’ve run a highly complex digital strategy for one of the largest brands in the world and experienced this first hand. It's this knowledge and experience that I aim to bring to Lansons."