Stevenage manager Graham Westley has signed defender Peter Hartley from Hartlepool for an undisclosed five-figure fee.
The 25-year-old, who is comfortable at left-back or at centre-back, played 181 times for Pools during his four years at the club.
Hartley told Boro's official club website: "I'm delighted to be here and I'm looking forward to getting my head down.
"The training ground here is different class, the attention to detail in and around the club is brilliant and I can't wait to get going."
Hartlepool boss Colin Cooper told his club's official website: "We received an offer and Peter was open to the idea of moving on.
"He leaves with our best wishes and hopefully it can give us a little bit of room to do some transfer business of our own."