Paul Turner, fundraising and communications director for International Medical Corps UK, will tell the Researchers in Fundraising conference that third parties can provide vital information, such as how much disposable income a donor has.
"Associates of wealthy donors can introduce them to your organisation and solicit a donation," Turner told Third Sector.
"If you get it wrong, donors may reject your request or be put off your charity. It could even put them off donating altogether, so you have a responsibility to get it right."
Other speakers will focus on issues such as approaching wealthy landowners and how to estimate wealth. The conference, called Estimating Wealth, will be held pn 1 July in London. For more information, visit the Researchers in Fundraising website.