Payment and Billing


I don't charge for the first one-hour session. After that, my rate is $95/hour. Please pay on the day of your session or before. You are welcome to pay for any number of sessions in advance.

  • Online
    • Pay with Dwolla. For more info and to sign up, visit To pay, visit this Dwolla payment form.
    • Pay via venmo or popmoney. Just sign in to venmo or popmoney (if you don't have an account, create one first) and send the payment to my email address. (It's my first name Contact me if that's confusing.)
    • Bank of America or Wells Fargo N.A. Customers. If you have an account at Bank of America or Wells Fargo N.A., you can use online banking to transfer payment to my email address. (Contact me if you don't know my email address.) For Bank of America, once you are signed in, click the Transfers tab and then on the left side click Add a new transfer recipient. I don't know how it's done via Wells Fargo but it ought to be similar.
    • PayPal
      • PayPal (easy way): Please use the button below to pay me online with either a credit card or a PayPal account. After you press the button, you should get a Paypal form. Here's what to put near the top:

        • Description: the student's name
        • Unit price: whatever you owe

        After that, choose one of "Don't have a PayPal account" (to use a credit card) or "Log in to PayPal" (if you have a PayPal account) and follow instructions.

        I never see your credit card number; you only need to trust PayPal with that.

      • PayPal (preferred method)

        If you have a PayPal account with a balance, I'd appreciate it if you'd pay me a different way: Login to your PayPal account and click the Send Money tab. Put my email address in the To field, fill in the amount field and choose I'm sending money to family or friends. This should avoid PayPal fees.

  • Check/bill payment from your bank

    I'm happy to accept payments by check or online bill payments from your bank, which arrive here as checks. Please send to Jon Dreyer, 81 Baker Ave, Lexington MA 02421-6228. Don't worry about an "account number" if you use bank bill payment.

  • Cash

    Cash is great, preferably in person. Please make sure I note your payment before you leave!


I usually don't send bills because I ask to be paid in advance. However, sometimes things get complicated and I send a bill, usually by email, and you can always request one. The bill, usually dating from the beginning of the calendar year, is usually in two separate files, one called the Customer Report and one invoice. The Customer Report contains all your payments and the grand total from the invoice. The "Total Due" line on the Customer Report is what I think you owe. (If it's negative that means I owe you.)The invoice shows the itemized charges but no payments, so you usually don't owe the "Amount Due" amount from the invoice! If any of this does not seem right, please let me know. (By the way, you can ignore the "0-30 days" etc. stuff on the Customer Report.) I use GnuCash to keep track of this stuff.

Thank you!

Jon Dreyer • Math tutorComputer Science
781-696-2614 • 81 Baker Ave, Lexington MA 02421-6228 • email

I have no special talent. I am only passionately curious. —Albert Einstein