[1] Heyman was just 18 years old when he started his own brokerage firm in a partnership with I. M. Levin, benefitting from favourable market conditions prior to leaving it again in 1849.

He worked as a broker for a few more years but increasingly engaged in real estate investments, development projects and industrial enterprises.

Heymans og Hustrus Sølvbryllups Stiftelse in connection with his and his wife's silver wedding anniversary in 1871.

It was located at Peder Hvitfeldts Stræde 8 and contained residences for "good and indigent unmarried people".

[2] It was in 1869 followed by J. V. Heyman og Hustrus Stiftelse for Officersenker at Viktoriagade 19 with five residents for officers' widows.