The brokerage has appointed a regional manager for Wales and the West.
Truswell announced he was leaving Together in June.
The firm delivered a 59% growth last year.
Profit before tax rose by 7.1%.
Cowan (pictured) was previously working part-time in a consultancy role at the lender.
A 12-month bridging loan of £54,490 was agreed.
In the first half of 2019 there were almost 300,000 changes to criteria.
The specialist distributor has appointed Kevin Blount and Michelle Neville.
Chapman joined Lendco in January.