Founded in 1999 with offices in the US, Europe and India, TSL's mission is to be the most efficient channel for sales lead generation and be the best sales development method that business-to-business companies can use to systematically drive sales.

TSL Marketing started out as Technology Sales Leads and was initially introduced as a marketing firm servicing the technology industry only. Over the years, TSL has grown into many industries outside of the technology sector and changed their name officially in January of 2008 to officially brand the company as a full service integrated marketing firm. TSL Marketing now services a cross-industry approach while still maintaining strong expertise in technology.

The company has a multi-lingual staff of more than 60 people based in the US and a call centre Europe with a full staff of experienced employees. TSL's clients include some of the fastest growing companies across the world.

TSL's investors include BDO Simpson Xavier and the Irish Government through their "Enterprise Ireland" agency.

TSL is privately owned and was founded by Michael Kelly and David English. Prior to TSL, Michael Kelly worked with IONA Technologies PLC in Europe. David English worked for IBM in the US before setting up TSL Marketing.