[1][2][8] Leffler is the co-author of Get Big Fast and Do More Good: Start Your Business, Make It Huge, and Change the World, a guide to entrepreneurship and brand-building.
[12][13] Able to afford only the essentials, if Leffler "wanted to do anything – go to the movies, travel, buy something – it was up to him to figure out how to pay for it."
[10][13][14][15] To help make ends meet, while working full-time as a school teacher, Yaffa Leffler began a successful Herbalife distributorship.
[19] Based in Tel Aviv, the company produced and marketed organic hair and skincare products.
After learning that 99.5% of the elementary school teachers in the United States paid for classroom supplies out of their own pocket,[23] Leffler and Kalish established a one-for-one system; each time a Yoobi product was purchased, an item such as crayons, pens, and rulers was added to a pack of school supplies which contained 1000 products.
The company donated a meal to Americans facing hunger through the nonprofit organization Feeding America for every product sold.
Beach House Group supports Clean the World, Girl Up, Kaboom and Starlight Children's Foundation.
Described by Fortune as the "Procter and Gamble for millennials," the company creates and sells organic and natural products.
[31] Leffler and Kalish wrote a guide to modern entrepreneurship, Get Big Fast and Do More Good, published by Harcourt in 2014.
"[9] He is an investor in and advisor for a wide variety of startups and established companies, and serves on the board of directors for Spark New Zealand.
He is a member of the Melbourne branch of the Young Presidents Organization, and serves as a trustee for the Asia Society and as a co-chair of their Center for Global Education.